1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * block.c --- iterate over all blocks in an inode
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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 <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 |
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19 | #include "ext2_fs.h"
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20 | #include "ext2fs.h"
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21 |
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22 | struct block_context {
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23 | ext2_filsys fs;
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24 | int (*func)(ext2_filsys fs,
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25 | blk_t *blocknr,
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26 | e2_blkcnt_t bcount,
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27 | blk_t ref_blk,
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28 | int ref_offset,
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29 | void *priv_data);
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30 | e2_blkcnt_t bcount;
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31 | int bsize;
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32 | int flags;
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33 | errcode_t errcode;
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34 | char *ind_buf;
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35 | char *dind_buf;
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36 | char *tind_buf;
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37 | void *priv_data;
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38 | };
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39 |
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40 | static int block_iterate_ind(blk_t *ind_block, blk_t ref_block,
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41 | int ref_offset, struct block_context *ctx)
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42 | {
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43 | int ret = 0, changed = 0;
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44 | int i, flags, limit, offset;
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45 | blk_t *block_nr;
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46 |
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47 | limit = ctx->fs->blocksize >> 2;
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48 | if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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49 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY))
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50 | ret = (*ctx->func)(ctx->fs, ind_block,
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51 | BLOCK_COUNT_IND, ref_block,
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52 | ref_offset, ctx->priv_data);
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53 | if (!*ind_block || (ret & BLOCK_ABORT)) {
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54 | ctx->bcount += limit;
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55 | return ret;
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56 | }
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57 | if (*ind_block >= ctx->fs->super->s_blocks_count ||
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58 | *ind_block < ctx->fs->super->s_first_data_block) {
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59 | ctx->errcode = EXT2_ET_BAD_IND_BLOCK;
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60 | ret |= BLOCK_ERROR;
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61 | return ret;
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62 | }
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63 | ctx->errcode = ext2fs_read_ind_block(ctx->fs, *ind_block,
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64 | ctx->ind_buf);
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65 | if (ctx->errcode) {
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66 | ret |= BLOCK_ERROR;
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67 | return ret;
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68 | }
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69 |
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70 | block_nr = (blk_t *) ctx->ind_buf;
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71 | offset = 0;
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72 | if (ctx->flags & BLOCK_FLAG_APPEND) {
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73 | for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
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74 | flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
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75 | *ind_block, offset,
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76 | ctx->priv_data);
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77 | changed |= flags;
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78 | if (flags & BLOCK_ABORT) {
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79 | ret |= BLOCK_ABORT;
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80 | break;
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81 | }
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82 | offset += sizeof(blk_t);
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83 | }
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84 | } else {
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85 | for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
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86 | if (*block_nr == 0)
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87 | continue;
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88 | flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
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89 | *ind_block, offset,
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90 | ctx->priv_data);
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91 | changed |= flags;
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92 | if (flags & BLOCK_ABORT) {
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93 | ret |= BLOCK_ABORT;
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94 | break;
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95 | }
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96 | offset += sizeof(blk_t);
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97 | }
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98 | }
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99 | if (changed & BLOCK_CHANGED) {
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100 | ctx->errcode = ext2fs_write_ind_block(ctx->fs, *ind_block,
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101 | ctx->ind_buf);
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102 | if (ctx->errcode)
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103 | ret |= BLOCK_ERROR | BLOCK_ABORT;
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104 | }
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105 | if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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106 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
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107 | !(ret & BLOCK_ABORT))
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108 | ret |= (*ctx->func)(ctx->fs, ind_block,
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109 | BLOCK_COUNT_IND, ref_block,
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110 | ref_offset, ctx->priv_data);
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111 | return ret;
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112 | }
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113 |
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114 | static int block_iterate_dind(blk_t *dind_block, blk_t ref_block,
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115 | int ref_offset, struct block_context *ctx)
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116 | {
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117 | int ret = 0, changed = 0;
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118 | int i, flags, limit, offset;
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119 | blk_t *block_nr;
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120 |
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121 | limit = ctx->fs->blocksize >> 2;
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122 | if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
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123 | BLOCK_FLAG_DATA_ONLY)))
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124 | ret = (*ctx->func)(ctx->fs, dind_block,
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125 | BLOCK_COUNT_DIND, ref_block,
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126 | ref_offset, ctx->priv_data);
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127 | if (!*dind_block || (ret & BLOCK_ABORT)) {
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128 | ctx->bcount += limit*limit;
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129 | return ret;
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130 | }
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131 | if (*dind_block >= ctx->fs->super->s_blocks_count ||
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132 | *dind_block < ctx->fs->super->s_first_data_block) {
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133 | ctx->errcode = EXT2_ET_BAD_DIND_BLOCK;
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134 | ret |= BLOCK_ERROR;
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135 | return ret;
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136 | }
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137 | ctx->errcode = ext2fs_read_ind_block(ctx->fs, *dind_block,
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138 | ctx->dind_buf);
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139 | if (ctx->errcode) {
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140 | ret |= BLOCK_ERROR;
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141 | return ret;
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142 | }
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143 |
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144 | block_nr = (blk_t *) ctx->dind_buf;
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145 | offset = 0;
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146 | if (ctx->flags & BLOCK_FLAG_APPEND) {
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147 | for (i = 0; i < limit; i++, block_nr++) {
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148 | flags = block_iterate_ind(block_nr,
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149 | *dind_block, offset,
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150 | ctx);
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151 | changed |= flags;
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152 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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153 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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154 | break;
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155 | }
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156 | offset += sizeof(blk_t);
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157 | }
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158 | } else {
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159 | for (i = 0; i < limit; i++, block_nr++) {
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160 | if (*block_nr == 0) {
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161 | ctx->bcount += limit;
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162 | continue;
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163 | }
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164 | flags = block_iterate_ind(block_nr,
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165 | *dind_block, offset,
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166 | ctx);
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167 | changed |= flags;
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168 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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169 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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170 | break;
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171 | }
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172 | offset += sizeof(blk_t);
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173 | }
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174 | }
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175 | if (changed & BLOCK_CHANGED) {
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176 | ctx->errcode = ext2fs_write_ind_block(ctx->fs, *dind_block,
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177 | ctx->dind_buf);
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178 | if (ctx->errcode)
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179 | ret |= BLOCK_ERROR | BLOCK_ABORT;
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180 | }
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181 | if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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182 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
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183 | !(ret & BLOCK_ABORT))
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184 | ret |= (*ctx->func)(ctx->fs, dind_block,
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185 | BLOCK_COUNT_DIND, ref_block,
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186 | ref_offset, ctx->priv_data);
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187 | return ret;
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188 | }
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189 |
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190 | static int block_iterate_tind(blk_t *tind_block, blk_t ref_block,
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191 | int ref_offset, struct block_context *ctx)
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192 | {
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193 | int ret = 0, changed = 0;
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194 | int i, flags, limit, offset;
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195 | blk_t *block_nr;
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196 |
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197 | limit = ctx->fs->blocksize >> 2;
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198 | if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
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199 | BLOCK_FLAG_DATA_ONLY)))
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200 | ret = (*ctx->func)(ctx->fs, tind_block,
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201 | BLOCK_COUNT_TIND, ref_block,
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202 | ref_offset, ctx->priv_data);
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203 | if (!*tind_block || (ret & BLOCK_ABORT)) {
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204 | ctx->bcount += limit*limit*limit;
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205 | return ret;
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206 | }
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207 | if (*tind_block >= ctx->fs->super->s_blocks_count ||
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208 | *tind_block < ctx->fs->super->s_first_data_block) {
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209 | ctx->errcode = EXT2_ET_BAD_TIND_BLOCK;
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210 | ret |= BLOCK_ERROR;
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211 | return ret;
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212 | }
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213 | ctx->errcode = ext2fs_read_ind_block(ctx->fs, *tind_block,
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214 | ctx->tind_buf);
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215 | if (ctx->errcode) {
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216 | ret |= BLOCK_ERROR;
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217 | return ret;
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218 | }
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219 |
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220 | block_nr = (blk_t *) ctx->tind_buf;
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221 | offset = 0;
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222 | if (ctx->flags & BLOCK_FLAG_APPEND) {
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223 | for (i = 0; i < limit; i++, block_nr++) {
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224 | flags = block_iterate_dind(block_nr,
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225 | *tind_block,
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226 | offset, ctx);
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227 | changed |= flags;
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228 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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229 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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230 | break;
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231 | }
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232 | offset += sizeof(blk_t);
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233 | }
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234 | } else {
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235 | for (i = 0; i < limit; i++, block_nr++) {
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236 | if (*block_nr == 0) {
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237 | ctx->bcount += limit*limit;
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238 | continue;
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239 | }
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240 | flags = block_iterate_dind(block_nr,
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241 | *tind_block,
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242 | offset, ctx);
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243 | changed |= flags;
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244 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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245 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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246 | break;
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247 | }
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248 | offset += sizeof(blk_t);
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249 | }
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250 | }
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251 | if (changed & BLOCK_CHANGED) {
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252 | ctx->errcode = ext2fs_write_ind_block(ctx->fs, *tind_block,
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253 | ctx->tind_buf);
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254 | if (ctx->errcode)
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255 | ret |= BLOCK_ERROR | BLOCK_ABORT;
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256 | }
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257 | if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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258 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
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259 | !(ret & BLOCK_ABORT))
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260 | ret |= (*ctx->func)(ctx->fs, tind_block,
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261 | BLOCK_COUNT_TIND, ref_block,
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262 | ref_offset, ctx->priv_data);
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263 |
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264 | return ret;
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265 | }
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266 |
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267 | errcode_t ext2fs_block_iterate2(ext2_filsys fs,
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268 | ext2_ino_t ino,
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269 | int flags,
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270 | char *block_buf,
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271 | int (*func)(ext2_filsys fs,
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272 | blk_t *blocknr,
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273 | e2_blkcnt_t blockcnt,
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274 | blk_t ref_blk,
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275 | int ref_offset,
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276 | void *priv_data),
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277 | void *priv_data)
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278 | {
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279 | int i;
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280 | int got_inode = 0;
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281 | int ret = 0;
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282 | blk_t blocks[EXT2_N_BLOCKS]; /* directory data blocks */
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283 | struct ext2_inode inode;
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284 | errcode_t retval;
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285 | struct block_context ctx;
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286 | int limit;
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287 |
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288 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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289 |
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290 | /*
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291 | * Check to see if we need to limit large files
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292 | */
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293 | if (flags & BLOCK_FLAG_NO_LARGE) {
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294 | ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
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295 | if (ctx.errcode)
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296 | return ctx.errcode;
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297 | got_inode = 1;
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298 | if (!LINUX_S_ISDIR(inode.i_mode) &&
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299 | (inode.i_size_high != 0))
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300 | return EXT2_ET_FILE_TOO_BIG;
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301 | }
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302 |
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303 | retval = ext2fs_get_blocks(fs, ino, blocks);
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304 | if (retval)
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305 | return retval;
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306 |
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307 | limit = fs->blocksize >> 2;
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308 |
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309 | ctx.fs = fs;
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310 | ctx.func = func;
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311 | ctx.priv_data = priv_data;
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312 | ctx.flags = flags;
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313 | ctx.bcount = 0;
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314 | if (block_buf) {
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315 | ctx.ind_buf = block_buf;
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316 | } else {
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317 | retval = ext2fs_get_mem(fs->blocksize * 3, &ctx.ind_buf);
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318 | if (retval)
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319 | return retval;
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320 | }
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321 | ctx.dind_buf = ctx.ind_buf + fs->blocksize;
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322 | ctx.tind_buf = ctx.dind_buf + fs->blocksize;
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323 |
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324 | /*
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325 | * Iterate over the HURD translator block (if present)
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326 | */
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327 | if ((fs->super->s_creator_os == EXT2_OS_HURD) &&
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328 | !(flags & BLOCK_FLAG_DATA_ONLY)) {
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329 | ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
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330 | if (ctx.errcode)
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331 | goto abort_exit;
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332 | got_inode = 1;
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333 | if (inode.osd1.hurd1.h_i_translator) {
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334 | ret |= (*ctx.func)(fs,
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335 | &inode.osd1.hurd1.h_i_translator,
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336 | BLOCK_COUNT_TRANSLATOR,
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337 | 0, 0, priv_data);
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338 | if (ret & BLOCK_ABORT)
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339 | goto abort_exit;
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340 | }
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341 | }
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342 |
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343 | /*
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344 | * Iterate over normal data blocks
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345 | */
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346 | for (i = 0; i < EXT2_NDIR_BLOCKS; i++, ctx.bcount++) {
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347 | if (blocks[i] || (flags & BLOCK_FLAG_APPEND)) {
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348 | ret |= (*ctx.func)(fs, &blocks[i],
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349 | ctx.bcount, 0, i, priv_data);
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350 | if (ret & BLOCK_ABORT)
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351 | goto abort_exit;
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352 | }
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353 | }
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354 | if (*(blocks + EXT2_IND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
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355 | ret |= block_iterate_ind(blocks + EXT2_IND_BLOCK,
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356 | 0, EXT2_IND_BLOCK, &ctx);
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357 | if (ret & BLOCK_ABORT)
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358 | goto abort_exit;
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359 | } else
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360 | ctx.bcount += limit;
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361 | if (*(blocks + EXT2_DIND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
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362 | ret |= block_iterate_dind(blocks + EXT2_DIND_BLOCK,
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363 | 0, EXT2_DIND_BLOCK, &ctx);
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364 | if (ret & BLOCK_ABORT)
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365 | goto abort_exit;
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366 | } else
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367 | ctx.bcount += limit * limit;
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368 | if (*(blocks + EXT2_TIND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
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369 | ret |= block_iterate_tind(blocks + EXT2_TIND_BLOCK,
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370 | 0, EXT2_TIND_BLOCK, &ctx);
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371 | if (ret & BLOCK_ABORT)
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372 | goto abort_exit;
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373 | }
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374 |
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375 | abort_exit:
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376 | if (ret & BLOCK_CHANGED) {
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377 | if (!got_inode) {
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378 | retval = ext2fs_read_inode(fs, ino, &inode);
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379 | if (retval)
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380 | return retval;
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381 | }
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382 | for (i=0; i < EXT2_N_BLOCKS; i++)
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383 | inode.i_block[i] = blocks[i];
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384 | retval = ext2fs_write_inode(fs, ino, &inode);
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385 | if (retval)
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386 | return retval;
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387 | }
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388 |
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389 | if (!block_buf)
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390 | ext2fs_free_mem(&ctx.ind_buf);
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391 |
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392 | return (ret & BLOCK_ERROR) ? ctx.errcode : 0;
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393 | }
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394 |
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395 | /*
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396 | * Emulate the old ext2fs_block_iterate function!
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397 | */
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398 |
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399 | struct xlate {
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400 | int (*func)(ext2_filsys fs,
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401 | blk_t *blocknr,
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402 | int bcount,
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403 | void *priv_data);
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404 | void *real_private;
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405 | };
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406 |
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407 | #ifdef __TURBOC__
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408 | # pragma argsused
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409 | #endif
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410 | static int xlate_func(ext2_filsys fs, blk_t *blocknr, e2_blkcnt_t blockcnt,
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411 | blk_t ref_block EXT2FS_ATTR((unused)),
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412 | int ref_offset EXT2FS_ATTR((unused)),
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413 | void *priv_data)
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414 | {
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415 | struct xlate *xl = (struct xlate *) priv_data;
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416 |
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417 | return (*xl->func)(fs, blocknr, (int) blockcnt, xl->real_private);
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418 | }
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419 |
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420 | errcode_t ext2fs_block_iterate(ext2_filsys fs,
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421 | ext2_ino_t ino,
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422 | int flags,
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423 | char *block_buf,
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424 | int (*func)(ext2_filsys fs,
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425 | blk_t *blocknr,
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426 | int blockcnt,
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427 | void *priv_data),
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428 | void *priv_data)
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429 | {
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430 | struct xlate xl;
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431 |
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432 | xl.real_private = priv_data;
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433 | xl.func = func;
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434 |
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435 | return ext2fs_block_iterate2(fs, ino, BLOCK_FLAG_NO_LARGE | flags,
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436 | block_buf, xlate_func, &xl);
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437 | }
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438 |
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