1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * badblocks.c --- routines to manipulate the bad block structure
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4 | *
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5 | * Copyright (C) 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 <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 | #include <fcntl.h>
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19 | #include <time.h>
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20 | #if HAVE_SYS_STAT_H
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21 | #include <sys/stat.h>
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22 | #endif
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23 | #if HAVE_SYS_TYPES_H
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24 | #include <sys/types.h>
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25 | #endif
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26 |
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27 | #include "ext2_fs.h"
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28 | #include "ext2fsP.h"
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29 |
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30 | /*
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31 | * Helper function for making a badblocks list
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32 | */
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33 | static errcode_t make_u32_list(int size, int num, __u32 *list,
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34 | ext2_u32_list *ret)
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35 | {
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36 | ext2_u32_list bb;
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37 | errcode_t retval;
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38 |
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39 | retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_list), &bb);
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40 | if (retval)
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41 | return retval;
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42 | memset(bb, 0, sizeof(struct ext2_struct_u32_list));
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43 | bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
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44 | bb->size = size ? size : 10;
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45 | bb->num = num;
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46 | retval = ext2fs_get_mem(bb->size * sizeof(blk_t), &bb->list);
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47 | if (!bb->list) {
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48 | ext2fs_free_mem(&bb);
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49 | return retval;
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50 | }
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51 | if (list)
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52 | memcpy(bb->list, list, bb->size * sizeof(blk_t));
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53 | else
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54 | memset(bb->list, 0, bb->size * sizeof(blk_t));
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55 | *ret = bb;
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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 | /*
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61 | * This procedure creates an empty u32 list.
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62 | */
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63 | errcode_t ext2fs_u32_list_create(ext2_u32_list *ret, int size)
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64 | {
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65 | return make_u32_list(size, 0, 0, ret);
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66 | }
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67 |
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68 | /*
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69 | * This procedure creates an empty badblocks list.
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70 | */
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71 | errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
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72 | {
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73 | return make_u32_list(size, 0, 0, (ext2_badblocks_list *) ret);
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74 | }
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75 |
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76 |
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77 | /*
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78 | * This procedure copies a badblocks list
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79 | */
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80 | errcode_t ext2fs_u32_copy(ext2_u32_list src, ext2_u32_list *dest)
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81 | {
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82 | errcode_t retval;
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83 |
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84 | retval = make_u32_list(src->size, src->num, src->list, dest);
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85 | if (retval)
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86 | return retval;
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87 | (*dest)->badblocks_flags = src->badblocks_flags;
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88 | return 0;
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89 | }
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90 |
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91 | errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
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92 | ext2_badblocks_list *dest)
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93 | {
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94 | return ext2fs_u32_copy((ext2_u32_list) src,
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95 | (ext2_u32_list *) dest);
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96 | }
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97 |
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98 | /*
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99 | * This procedure frees a badblocks list.
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100 | *
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101 | * (note: moved to closefs.c)
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102 | */
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103 |
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104 |
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105 | /*
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106 | * This procedure adds a block to a badblocks list.
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107 | */
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108 | errcode_t ext2fs_u32_list_add(ext2_u32_list bb, __u32 blk)
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109 | {
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110 | errcode_t retval;
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111 | int i, j;
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112 | unsigned long old_size;
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113 |
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114 | EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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115 |
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116 | if (bb->num >= bb->size) {
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117 | old_size = bb->size * sizeof(__u32);
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118 | bb->size += 100;
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119 | retval = ext2fs_resize_mem(old_size, bb->size * sizeof(__u32),
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120 | &bb->list);
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121 | if (retval) {
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122 | bb->size -= 100;
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123 | return retval;
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124 | }
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125 | }
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126 |
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127 | /*
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128 | * Add special case code for appending to the end of the list
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129 | */
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130 | i = bb->num-1;
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131 | if ((bb->num != 0) && (bb->list[i] == blk))
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132 | return 0;
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133 | if ((bb->num == 0) || (bb->list[i] < blk)) {
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134 | bb->list[bb->num++] = blk;
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135 | return 0;
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136 | }
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137 |
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138 | j = bb->num;
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139 | for (i=0; i < bb->num; i++) {
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140 | if (bb->list[i] == blk)
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141 | return 0;
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142 | if (bb->list[i] > blk) {
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143 | j = i;
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144 | break;
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145 | }
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146 | }
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147 | for (i=bb->num; i > j; i--)
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148 | bb->list[i] = bb->list[i-1];
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149 | bb->list[j] = blk;
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150 | bb->num++;
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151 | return 0;
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152 | }
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153 |
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154 | errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
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155 | {
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156 | return ext2fs_u32_list_add((ext2_u32_list) bb, (__u32) blk);
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157 | }
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158 |
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159 | /*
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160 | * This procedure finds a particular block is on a badblocks
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161 | * list.
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162 | */
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163 | int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
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164 | {
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165 | int low, high, mid;
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166 |
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167 | if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
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168 | return -1;
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169 |
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170 | if (bb->num == 0)
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171 | return -1;
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172 |
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173 | low = 0;
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174 | high = bb->num-1;
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175 | if (blk == bb->list[low])
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176 | return low;
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177 | if (blk == bb->list[high])
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178 | return high;
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179 |
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180 | while (low < high) {
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181 | mid = (low+high)/2;
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182 | if (mid == low || mid == high)
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183 | break;
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184 | if (blk == bb->list[mid])
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185 | return mid;
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186 | if (blk < bb->list[mid])
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187 | high = mid;
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188 | else
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189 | low = mid;
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190 | }
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191 | return -1;
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192 | }
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193 |
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194 | /*
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195 | * This procedure tests to see if a particular block is on a badblocks
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196 | * list.
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197 | */
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198 | int ext2fs_u32_list_test(ext2_u32_list bb, __u32 blk)
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199 | {
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200 | if (ext2fs_u32_list_find(bb, blk) < 0)
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201 | return 0;
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202 | else
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203 | return 1;
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204 | }
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205 |
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206 | int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
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207 | {
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208 | return ext2fs_u32_list_test((ext2_u32_list) bb, (__u32) blk);
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209 | }
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210 |
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211 |
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212 | /*
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213 | * Remove a block from the badblock list
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214 | */
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215 | int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk)
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216 | {
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217 | int remloc, i;
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218 |
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219 | if (bb->num == 0)
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220 | return -1;
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221 |
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222 | remloc = ext2fs_u32_list_find(bb, blk);
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223 | if (remloc < 0)
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224 | return -1;
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225 |
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226 | for (i = remloc; i < bb->num - 1; i++)
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227 | bb->list[i] = bb->list[i+1];
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228 | bb->num--;
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229 | return 0;
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230 | }
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231 |
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232 | void ext2fs_badblocks_list_del(ext2_u32_list bb, __u32 blk)
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233 | {
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234 | ext2fs_u32_list_del(bb, blk);
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235 | }
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236 |
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237 | errcode_t ext2fs_u32_list_iterate_begin(ext2_u32_list bb,
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238 | ext2_u32_iterate *ret)
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239 | {
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240 | ext2_u32_iterate iter;
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241 | errcode_t retval;
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242 |
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243 | EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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244 |
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245 | retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_iterate), &iter);
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246 | if (retval)
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247 | return retval;
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248 |
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249 | iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
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250 | iter->bb = bb;
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251 | iter->ptr = 0;
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252 | *ret = iter;
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253 | return 0;
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254 | }
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255 |
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256 | errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
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257 | ext2_badblocks_iterate *ret)
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258 | {
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259 | return ext2fs_u32_list_iterate_begin((ext2_u32_list) bb,
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260 | (ext2_u32_iterate *) ret);
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261 | }
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262 |
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263 |
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264 | int ext2fs_u32_list_iterate(ext2_u32_iterate iter, __u32 *blk)
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265 | {
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266 | ext2_u32_list bb;
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267 |
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268 | if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
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269 | return 0;
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270 |
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271 | bb = iter->bb;
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272 |
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273 | if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
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274 | return 0;
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275 |
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276 | if (iter->ptr < bb->num) {
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277 | *blk = bb->list[iter->ptr++];
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278 | return 1;
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279 | }
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280 | *blk = 0;
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281 | return 0;
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282 | }
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283 |
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284 | int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
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285 | {
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286 | return ext2fs_u32_list_iterate((ext2_u32_iterate) iter,
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287 | (__u32 *) blk);
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288 | }
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289 |
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290 |
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291 | void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter)
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292 | {
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293 | if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
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294 | return;
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295 |
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296 | iter->bb = 0;
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297 | ext2fs_free_mem(&iter);
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298 | }
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299 |
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300 | void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
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301 | {
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302 | ext2fs_u32_list_iterate_end((ext2_u32_iterate) iter);
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303 | }
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304 |
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305 |
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306 | int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2)
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307 | {
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308 | EXT2_CHECK_MAGIC(bb1, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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309 | EXT2_CHECK_MAGIC(bb2, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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310 |
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311 | if (bb1->num != bb2->num)
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312 | return 0;
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313 |
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314 | if (memcmp(bb1->list, bb2->list, bb1->num * sizeof(blk_t)) != 0)
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315 | return 0;
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316 | return 1;
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317 | }
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318 |
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319 | int ext2fs_badblocks_equal(ext2_badblocks_list bb1, ext2_badblocks_list bb2)
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320 | {
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321 | return ext2fs_u32_list_equal((ext2_u32_list) bb1,
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322 | (ext2_u32_list) bb2);
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323 | }
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324 |
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325 | int ext2fs_u32_list_count(ext2_u32_list bb)
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326 | {
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327 | return bb->num;
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328 | }
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