1 | /*
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2 | * bb_inode.c --- routines to update the bad block inode.
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3 | *
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4 | * WARNING: This routine modifies a lot of state in the filesystem; if
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5 | * this routine returns an error, the bad block inode may be in an
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6 | * inconsistent state.
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7 | *
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8 | * Copyright (C) 1994, 1995 Theodore Ts'o.
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9 | *
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10 | * %Begin-Header%
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11 | * This file may be redistributed under the terms of the GNU Public
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12 | * License.
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13 | * %End-Header%
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14 | */
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15 |
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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 | #include <fcntl.h>
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22 | #include <time.h>
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23 | #if HAVE_SYS_STAT_H
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24 | #include <sys/stat.h>
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25 | #endif
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26 | #if HAVE_SYS_TYPES_H
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27 | #include <sys/types.h>
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28 | #endif
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29 |
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30 | #include "ext2_fs.h"
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31 | #include "ext2fs.h"
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32 |
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33 | struct set_badblock_record {
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34 | ext2_badblocks_iterate bb_iter;
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35 | int bad_block_count;
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36 | blk_t *ind_blocks;
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37 | int max_ind_blocks;
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38 | int ind_blocks_size;
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39 | int ind_blocks_ptr;
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40 | char *block_buf;
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41 | errcode_t err;
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42 | };
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43 |
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44 | static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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45 | e2_blkcnt_t blockcnt,
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46 | blk_t ref_block, int ref_offset,
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47 | void *priv_data);
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48 | static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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49 | e2_blkcnt_t blockcnt,
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50 | blk_t ref_block, int ref_offset,
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51 | void *priv_data);
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52 |
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53 | /*
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54 | * Given a bad blocks bitmap, update the bad blocks inode to reflect
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55 | * the map.
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56 | */
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57 | errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list)
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58 | {
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59 | errcode_t retval;
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60 | struct set_badblock_record rec;
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61 | struct ext2_inode inode;
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62 |
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63 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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64 |
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65 | if (!fs->block_map)
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66 | return EXT2_ET_NO_BLOCK_BITMAP;
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67 |
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68 | rec.bad_block_count = 0;
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69 | rec.ind_blocks_size = rec.ind_blocks_ptr = 0;
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70 | rec.max_ind_blocks = 10;
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71 | retval = ext2fs_get_mem(rec.max_ind_blocks * sizeof(blk_t),
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72 | &rec.ind_blocks);
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73 | if (retval)
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74 | return retval;
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75 | memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
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76 | retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf);
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77 | if (retval)
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78 | goto cleanup;
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79 | memset(rec.block_buf, 0, fs->blocksize);
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80 | rec.err = 0;
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81 |
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82 | /*
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83 | * First clear the old bad blocks (while saving the indirect blocks)
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84 | */
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85 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
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86 | BLOCK_FLAG_DEPTH_TRAVERSE, 0,
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87 | clear_bad_block_proc, &rec);
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88 | if (retval)
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89 | goto cleanup;
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90 | if (rec.err) {
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91 | retval = rec.err;
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92 | goto cleanup;
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93 | }
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94 |
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95 | /*
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96 | * Now set the bad blocks!
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97 | *
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98 | * First, mark the bad blocks as used. This prevents a bad
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99 | * block from being used as an indirecto block for the bad
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100 | * block inode (!).
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101 | */
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102 | if (bb_list) {
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103 | retval = ext2fs_badblocks_list_iterate_begin(bb_list,
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104 | &rec.bb_iter);
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105 | if (retval)
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106 | goto cleanup;
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107 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
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108 | BLOCK_FLAG_APPEND, 0,
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109 | set_bad_block_proc, &rec);
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110 | ext2fs_badblocks_list_iterate_end(rec.bb_iter);
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111 | if (retval)
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112 | goto cleanup;
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113 | if (rec.err) {
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114 | retval = rec.err;
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115 | goto cleanup;
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116 | }
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117 | }
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118 |
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119 | /*
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120 | * Update the bad block inode's mod time and block count
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121 | * field.
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122 | */
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123 | retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
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124 | if (retval)
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125 | goto cleanup;
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126 |
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127 | inode.i_atime = inode.i_mtime = time(0);
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128 | if (!inode.i_ctime)
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129 | inode.i_ctime = time(0);
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130 | inode.i_blocks = rec.bad_block_count * (fs->blocksize / 512);
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131 | inode.i_size = rec.bad_block_count * fs->blocksize;
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132 |
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133 | retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
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134 | if (retval)
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135 | goto cleanup;
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136 |
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137 | cleanup:
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138 | ext2fs_free_mem(&rec.ind_blocks);
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139 | ext2fs_free_mem(&rec.block_buf);
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140 | return retval;
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141 | }
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142 |
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143 | /*
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144 | * Helper function for update_bb_inode()
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145 | *
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146 | * Clear the bad blocks in the bad block inode, while saving the
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147 | * indirect blocks.
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148 | */
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149 | #ifdef __TURBOC__
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150 | # pragma argsused
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151 | #endif
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152 | static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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153 | e2_blkcnt_t blockcnt,
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154 | blk_t ref_block EXT2FS_ATTR((unused)),
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155 | int ref_offset EXT2FS_ATTR((unused)),
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156 | void *priv_data)
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157 | {
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158 | struct set_badblock_record *rec = (struct set_badblock_record *)
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159 | priv_data;
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160 | errcode_t retval;
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161 | unsigned long old_size;
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162 |
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163 | if (!*block_nr)
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164 | return 0;
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165 |
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166 | /*
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167 | * If the block number is outrageous, clear it and ignore it.
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168 | */
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169 | if (*block_nr >= fs->super->s_blocks_count ||
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170 | *block_nr < fs->super->s_first_data_block) {
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171 | *block_nr = 0;
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172 | return BLOCK_CHANGED;
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173 | }
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174 |
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175 | if (blockcnt < 0) {
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176 | if (rec->ind_blocks_size >= rec->max_ind_blocks) {
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177 | old_size = rec->max_ind_blocks * sizeof(blk_t);
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178 | rec->max_ind_blocks += 10;
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179 | retval = ext2fs_resize_mem(old_size,
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180 | rec->max_ind_blocks * sizeof(blk_t),
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181 | &rec->ind_blocks);
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182 | if (retval) {
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183 | rec->max_ind_blocks -= 10;
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184 | rec->err = retval;
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185 | return BLOCK_ABORT;
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186 | }
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187 | }
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188 | rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
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189 | }
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190 |
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191 | /*
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192 | * Mark the block as unused, and update accounting information
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193 | */
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194 | ext2fs_block_alloc_stats(fs, *block_nr, -1);
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195 |
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196 | *block_nr = 0;
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197 | return BLOCK_CHANGED;
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198 | }
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199 |
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200 |
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201 | /*
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202 | * Helper function for update_bb_inode()
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203 | *
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204 | * Set the block list in the bad block inode, using the supplied bitmap.
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205 | */
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206 | #ifdef __TURBOC__
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207 | #pragma argsused
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208 | #endif
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209 | static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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210 | e2_blkcnt_t blockcnt,
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211 | blk_t ref_block EXT2FS_ATTR((unused)),
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212 | int ref_offset EXT2FS_ATTR((unused)),
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213 | void *priv_data)
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214 | {
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215 | struct set_badblock_record *rec = (struct set_badblock_record *)
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216 | priv_data;
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217 | errcode_t retval;
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218 | blk_t blk;
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219 |
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220 | if (blockcnt >= 0) {
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221 | /*
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222 | * Get the next bad block.
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223 | */
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224 | if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
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225 | return BLOCK_ABORT;
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226 | rec->bad_block_count++;
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227 | } else {
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228 | /*
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229 | * An indirect block; fetch a block from the
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230 | * previously used indirect block list. The block
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231 | * most be not marked as used; if so, get another one.
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232 | * If we run out of reserved indirect blocks, allocate
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233 | * a new one.
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234 | */
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235 | retry:
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236 | if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
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237 | blk = rec->ind_blocks[rec->ind_blocks_ptr++];
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238 | if (ext2fs_test_block_bitmap(fs->block_map, blk))
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239 | goto retry;
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240 | } else {
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241 | retval = ext2fs_new_block(fs, 0, 0, &blk);
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242 | if (retval) {
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243 | rec->err = retval;
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244 | return BLOCK_ABORT;
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245 | }
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246 | }
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247 | retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf);
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248 | if (retval) {
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249 | rec->err = retval;
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250 | return BLOCK_ABORT;
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251 | }
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252 | }
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253 |
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254 | /*
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255 | * Update block counts
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256 | */
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257 | ext2fs_block_alloc_stats(fs, blk, +1);
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258 |
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259 | *block_nr = blk;
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260 | return BLOCK_CHANGED;
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261 | }
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262 |
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263 |
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264 |
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265 |
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266 |
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267 |
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