1 | /*
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2 | * brel_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 | * TODO: rewrite to not use a direct array!!! (Fortunately this
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7 | * module isn't really used yet.)
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8 | *
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9 | * %Begin-Header%
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10 | * This file may be redistributed under the terms of the GNU Public
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11 | * License.
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12 | * %End-Header%
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13 | */
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14 |
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15 | #include <fcntl.h>
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16 | #include <stdio.h>
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17 | #include <string.h>
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18 | #if HAVE_UNISTD_H
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19 | #include <unistd.h>
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20 | #endif
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21 | #if HAVE_ERRNO_H
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22 | #include <errno.h>
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23 | #endif
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24 |
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25 | #include "ext2_fs.h"
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26 | #include "ext2fs.h"
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27 | #include "brel.h"
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28 |
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29 | static errcode_t bma_put(ext2_brel brel, blk_t old,
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30 | struct ext2_block_relocate_entry *ent);
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31 | static errcode_t bma_get(ext2_brel brel, blk_t old,
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32 | struct ext2_block_relocate_entry *ent);
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33 | static errcode_t bma_start_iter(ext2_brel brel);
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34 | static errcode_t bma_next(ext2_brel brel, blk_t *old,
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35 | struct ext2_block_relocate_entry *ent);
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36 | static errcode_t bma_move(ext2_brel brel, blk_t old, blk_t new);
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37 | static errcode_t bma_delete(ext2_brel brel, blk_t old);
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38 | static errcode_t bma_free(ext2_brel brel);
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39 |
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40 | struct brel_ma {
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41 | __u32 magic;
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42 | blk_t max_block;
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43 | struct ext2_block_relocate_entry *entries;
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44 | };
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45 |
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46 | errcode_t ext2fs_brel_memarray_create(char *name, blk_t max_block,
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47 | ext2_brel *new_brel)
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48 | {
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49 | ext2_brel brel = 0;
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50 | errcode_t retval;
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51 | struct brel_ma *ma = 0;
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52 | size_t size;
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53 |
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54 | *new_brel = 0;
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55 |
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56 | /*
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57 | * Allocate memory structures
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58 | */
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59 | retval = ext2fs_get_mem(sizeof(struct ext2_block_relocation_table),
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60 | &brel);
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61 | if (retval)
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62 | goto errout;
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63 | memset(brel, 0, sizeof(struct ext2_block_relocation_table));
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64 |
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65 | retval = ext2fs_get_mem(strlen(name)+1, &brel->name);
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66 | if (retval)
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67 | goto errout;
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68 | strcpy(brel->name, name);
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69 |
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70 | retval = ext2fs_get_mem(sizeof(struct brel_ma), &ma);
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71 | if (retval)
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72 | goto errout;
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73 | memset(ma, 0, sizeof(struct brel_ma));
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74 | brel->priv_data = ma;
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75 |
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76 | size = (size_t) (sizeof(struct ext2_block_relocate_entry) *
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77 | (max_block+1));
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78 | retval = ext2fs_get_mem(size, &ma->entries);
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79 | if (retval)
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80 | goto errout;
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81 | memset(ma->entries, 0, size);
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82 | ma->max_block = max_block;
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83 |
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84 | /*
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85 | * Fill in the brel data structure
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86 | */
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87 | brel->put = bma_put;
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88 | brel->get = bma_get;
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89 | brel->start_iter = bma_start_iter;
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90 | brel->next = bma_next;
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91 | brel->move = bma_move;
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92 | brel->delete = bma_delete;
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93 | brel->free = bma_free;
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94 |
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95 | *new_brel = brel;
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96 | return 0;
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97 |
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98 | errout:
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99 | bma_free(brel);
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100 | return retval;
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101 | }
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102 |
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103 | static errcode_t bma_put(ext2_brel brel, blk_t old,
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104 | struct ext2_block_relocate_entry *ent)
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105 | {
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106 | struct brel_ma *ma;
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107 |
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108 | ma = brel->priv_data;
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109 | if (old > ma->max_block)
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110 | return EXT2_ET_INVALID_ARGUMENT;
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111 | ma->entries[(unsigned)old] = *ent;
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112 | return 0;
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113 | }
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114 |
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115 | static errcode_t bma_get(ext2_brel brel, blk_t old,
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116 | struct ext2_block_relocate_entry *ent)
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117 | {
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118 | struct brel_ma *ma;
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119 |
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120 | ma = brel->priv_data;
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121 | if (old > ma->max_block)
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122 | return EXT2_ET_INVALID_ARGUMENT;
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123 | if (ma->entries[(unsigned)old].new == 0)
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124 | return ENOENT;
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125 | *ent = ma->entries[old];
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126 | return 0;
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127 | }
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128 |
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129 | static errcode_t bma_start_iter(ext2_brel brel)
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130 | {
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131 | brel->current = 0;
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132 | return 0;
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133 | }
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134 |
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135 | static errcode_t bma_next(ext2_brel brel, blk_t *old,
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136 | struct ext2_block_relocate_entry *ent)
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137 | {
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138 | struct brel_ma *ma;
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139 |
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140 | ma = brel->priv_data;
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141 | while (++brel->current < ma->max_block) {
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142 | if (ma->entries[(unsigned)brel->current].new == 0)
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143 | continue;
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144 | *old = brel->current;
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145 | *ent = ma->entries[(unsigned)brel->current];
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146 | return 0;
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147 | }
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148 | *old = 0;
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149 | return 0;
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150 | }
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151 |
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152 | static errcode_t bma_move(ext2_brel brel, blk_t old, blk_t new)
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153 | {
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154 | struct brel_ma *ma;
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155 |
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156 | ma = brel->priv_data;
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157 | if ((old > ma->max_block) || (new > ma->max_block))
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158 | return EXT2_ET_INVALID_ARGUMENT;
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159 | if (ma->entries[(unsigned)old].new == 0)
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160 | return ENOENT;
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161 | ma->entries[(unsigned)new] = ma->entries[old];
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162 | ma->entries[(unsigned)old].new = 0;
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163 | return 0;
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164 | }
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165 |
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166 | static errcode_t bma_delete(ext2_brel brel, blk_t old)
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167 | {
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168 | struct brel_ma *ma;
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169 |
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170 | ma = brel->priv_data;
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171 | if (old > ma->max_block)
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172 | return EXT2_ET_INVALID_ARGUMENT;
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173 | if (ma->entries[(unsigned)old].new == 0)
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174 | return ENOENT;
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175 | ma->entries[(unsigned)old].new = 0;
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176 | return 0;
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177 | }
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178 |
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179 | static errcode_t bma_free(ext2_brel brel)
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180 | {
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181 | struct brel_ma *ma;
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182 |
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183 | if (!brel)
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184 | return 0;
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185 |
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186 | ma = brel->priv_data;
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187 |
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188 | if (ma) {
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189 | ext2fs_free_mem(&ma->entries);
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190 | ext2fs_free_mem(&ma);
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191 | }
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192 | ext2fs_free_mem(&brel->name);
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193 | ext2fs_free_mem(&brel);
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194 | return 0;
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195 | }
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