annotate toys/other/mke2fs.c @ 694:786841fdb1e0

Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style. The actual code should be the same afterward, this is just cosmetic refactoring.
author Rob Landley <rob@landley.net>
date Tue, 13 Nov 2012 17:14:08 -0600
parents 7e846e281e38
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* mke2fs.c - Create an ext2 filesystem image.
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2 *
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30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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3 * Copyright 2006, 2007 Rob Landley <rob@landley.net>
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4
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6b292ee780ab Minor cleanup: move mke2fs options into mke2fs.c.
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5 // Still to go: "E:jJ:L:m:O:"
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6 USE_MKE2FS(NEWTOY(mke2fs, "<1>2g:Fnqm#N#i#b#", TOYFLAG_SBIN))
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7
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8 config MKE2FS
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9 bool "mke2fs (unfinished and broken by dirtree changes)"
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10 default n
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11 help
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12 usage: mke2fs [-Fnq] [-b ###] [-N|i ###] [-m ###] device
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14 Create an ext2 filesystem on a block device or filesystem image.
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16 -F Force to run on a mounted device
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17 -n Don't write to device
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18 -q Quiet (no output)
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19 -b size Block size (1024, 2048, or 4096)
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20 -N inodes Allocate this many inodes
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21 -i bytes Allocate one inode for every XXX bytes of device
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22 -m percent Reserve this percent of filesystem space for root user
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24 config MKE2FS_JOURNAL
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25 bool "Journaling support (ext3)"
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26 default n
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27 depends on MKE2FS
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28 help
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29 usage: [-j] [-J size=###,device=XXX]
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31 -j Create journal (ext3)
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32 -J Journal options
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33 size: Number of blocks (1024-102400)
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34 device: Specify an external journal
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36 config MKE2FS_GEN
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37 bool "Generate (gene2fs)"
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38 default n
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39 depends on MKE2FS
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40 help
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41 usage: gene2fs [options] device filename
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43 The [options] are the same as mke2fs.
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45 config MKE2FS_LABEL
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46 bool "Label support"
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47 default n
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48 depends on MKE2FS
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49 help
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50 usage: mke2fs [-L label] [-M path] [-o string]
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52 -L Volume label
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53 -M Path to mount point
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54 -o Created by
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56 config MKE2FS_EXTENDED
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57 bool "Extended options"
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58 default n
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59 depends on MKE2FS
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60 help
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61 usage: mke2fs [-E stride=###] [-O option[,option]]
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63 -E stride= Set RAID stripe size (in blocks)
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64 -O [opts] Specify fewer ext2 option flags (for old kernels)
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65 All of these are on by default (as appropriate)
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66 none Clear default options (all but journaling)
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67 dir_index Use htree indexes for large directories
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68 filetype Store file type info in directory entry
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69 has_journal Set by -j
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70 journal_dev Set by -J device=XXX
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71 sparse_super Don't allocate huge numbers of redundant superblocks
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72 */
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73
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74 #define FOR_mke2fs
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75 #include "toys.h"
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76
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77 GLOBALS(
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78 // Command line arguments.
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79 long blocksize;
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80 long bytes_per_inode;
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81 long inodes; // Total inodes in filesystem.
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82 long reserved_percent; // Integer precent of space to reserve for root.
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83 char *gendir; // Where to read dirtree from.
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85 // Internal data.
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86 struct dirtree *dt; // Tree of files to copy into the new filesystem.
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87 unsigned treeblocks; // Blocks used by dt
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88 unsigned treeinodes; // Inodes used by dt
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90 unsigned blocks; // Total blocks in the filesystem.
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91 unsigned freeblocks; // Free blocks in the filesystem.
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92 unsigned inodespg; // Inodes per group
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93 unsigned groups; // Total number of block groups.
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94 unsigned blockbits; // Bits per block. (Also blocks per group.)
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95
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96 // For gene2fs
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97 unsigned nextblock; // Next data block to allocate
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98 unsigned nextgroup; // Next group we'll be allocating from
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99 int fsfd; // File descriptor of filesystem (to output to).
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100
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101 struct ext2_superblock sb;
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102 )
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103
112
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104 #define INODES_RESERVED 10
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105
112
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106 static uint32_t div_round_up(uint32_t a, uint32_t b)
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107 {
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108 uint32_t c = a/b;
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109
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110 if (a%b) c++;
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111 return c;
112
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112 }
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113
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114 // Calculate data blocks plus index blocks needed to hold a file.
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115
112
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116 static uint32_t file_blocks_used(uint64_t size, uint32_t *blocklist)
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117 {
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118 uint32_t dblocks = (uint32_t)((size+(TT.blocksize-1))/TT.blocksize);
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119 uint32_t idx=TT.blocksize/4, iblocks=0, diblocks=0, tiblocks=0;
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120
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121 // Fill out index blocks in inode.
112
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122
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123 if (blocklist) {
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124 int i;
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125
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126 // Direct index blocks
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127 for (i=0; i<13 && i<dblocks; i++) blocklist[i] = i;
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128 // Singly indirect index blocks
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129 if (dblocks > 13+idx) blocklist[13] = 13+idx;
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130 // Doubly indirect index blocks
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131 idx = 13 + idx + (idx*idx);
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132 if (dblocks > idx) blocklist[14] = idx;
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133
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134 return 0;
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135 }
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136
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137 // Account for direct, singly, doubly, and triply indirect index blocks
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138
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139 if (dblocks > 12) {
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140 iblocks = ((dblocks-13)/idx)+1;
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141 if (iblocks > 1) {
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142 diblocks = ((iblocks-2)/idx)+1;
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143 if (diblocks > 1)
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144 tiblocks = ((diblocks-2)/idx)+1;
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145 }
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146 }
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147
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148 return dblocks + iblocks + diblocks + tiblocks;
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149 }
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150
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151 // Use the parent pointer to iterate through the tree non-recursively.
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152 static struct dirtree *treenext(struct dirtree *this)
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153 {
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154 while (this && !this->next) this = this->parent;
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155 if (this) this = this->next;
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156
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157 return this;
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158 }
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159
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160 // Recursively calculate the number of blocks used by each inode in the tree.
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161 // Returns blocks used by this directory, assigns bytes used to *size.
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162 // Writes total block count to TT.treeblocks and inode count to TT.treeinodes.
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163
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164 static long check_treesize(struct dirtree *that, off_t *size)
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165 {
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166 long blocks;
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167
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168 while (that) {
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169 *size += sizeof(struct ext2_dentry) + strlen(that->name);
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170
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171 if (that->child)
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172 that->st.st_blocks = check_treesize(that->child, &that->st.st_size);
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173 else if (S_ISREG(that->st.st_mode)) {
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174 that->st.st_blocks = file_blocks_used(that->st.st_size, 0);
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175 TT.treeblocks += that->st.st_blocks;
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176 }
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177 that = that->next;
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178 }
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179 TT.treeblocks += blocks = file_blocks_used(*size, 0);
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180 TT.treeinodes++;
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181
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182 return blocks;
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183 }
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184
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185 // Calculate inode numbers and link counts.
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186 //
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187 // To do this right I need to copy the tree and sort it, but here's a really
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188 // ugly n^2 way of dealing with the problem that doesn't scale well to large
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189 // numbers of files (> 100,000) but can be done in very little code.
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190 // This rewrites inode numbers to their final values, allocating depth first.
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191
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192 static void check_treelinks(struct dirtree *tree)
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193 {
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194 struct dirtree *current=tree, *that;
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195 long inode = INODES_RESERVED;
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196
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197 while (current) {
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198 ++inode;
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199 // Since we can't hardlink to directories, we know their link count.
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200 if (S_ISDIR(current->st.st_mode)) current->st.st_nlink = 2;
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201 else {
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202 dev_t new = current->st.st_dev;
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203
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204 if (!new) continue;
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205
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206 // Look for other copies of current node
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207 current->st.st_nlink = 0;
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208 for (that = tree; that; that = treenext(that)) {
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209 if (current->st.st_ino == that->st.st_ino &&
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210 current->st.st_dev == that->st.st_dev)
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211 {
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212 current->st.st_nlink++;
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213 current->st.st_ino = inode;
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214 }
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215 }
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216 }
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217 current->st.st_ino = inode;
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218 current = treenext(current);
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219 }
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220 }
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221
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222 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
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223 // we should generate a uuid structure by reading a clock with 100 nanosecond
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224 // precision, normalizing it to the start of the gregorian calendar in 1582,
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225 // and looking up our eth0 mac address.
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226 //
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227 // On the other hand, we have 128 bits to come up with a unique identifier, of
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228 // which 6 have a defined value. /dev/urandom it is.
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229
143
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230 static void create_uuid(char *uuid)
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231 {
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232 // Read 128 random bits
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233 int fd = xopen("/dev/urandom", O_RDONLY);
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234 xreadall(fd, uuid, 16);
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235 close(fd);
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236
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237 // Claim to be a DCE format UUID.
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238 uuid[6] = (uuid[6] & 0x0F) | 0x40;
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239 uuid[8] = (uuid[8] & 0x3F) | 0x80;
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240
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241 // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should
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242 // set bit 1 of the node ID, which is the mac multicast bit. This means we
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243 // should never collide with anybody actually using a macaddr.
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244 uuid[11] = uuid[11] | 128;
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245 }
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246
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247 // Calculate inodes per group from total inodes.
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248 static uint32_t get_inodespg(uint32_t inodes)
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249 {
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250 uint32_t temp;
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251
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252 // Round up to fill complete inode blocks.
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253 temp = (inodes + TT.groups - 1) / TT.groups;
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254 inodes = TT.blocksize/sizeof(struct ext2_inode);
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255 return ((temp + inodes - 1)/inodes)*inodes;
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256 }
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257
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258 // Fill out superblock and TT structures.
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259
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260 static void init_superblock(struct ext2_superblock *sb)
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261 {
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262 uint32_t temp;
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263
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264 // Set log_block_size and log_frag_size.
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265
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266 for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break;
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267 if (temp==4) error_exit("bad blocksize");
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268 sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp);
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269
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270 // Fill out blocks_count, r_blocks_count, first_data_block
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271
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272 sb->blocks_count = SWAP_LE32(TT.blocks);
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273 sb->free_blocks_count = SWAP_LE32(TT.freeblocks);
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274 temp = (TT.blocks * (uint64_t)TT.reserved_percent) / 100;
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275 sb->r_blocks_count = SWAP_LE32(temp);
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276
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277 sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0);
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278
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279 // Set blocks_per_group and frags_per_group, which is the size of an
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280 // allocation bitmap that fits in one block (I.E. how many bits per block)?
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281
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282 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(TT.blockbits);
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283
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284 // Set inodes_per_group and total inodes_count
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285 sb->inodes_per_group = SWAP_LE32(TT.inodespg);
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286 sb->inodes_count = SWAP_LE32(TT.inodespg * TT.groups);
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287
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288 // Determine free inodes.
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289 temp = TT.inodespg*TT.groups - INODES_RESERVED;
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290 if (temp < TT.treeinodes) error_exit("Not enough inodes.\n");
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291 sb->free_inodes_count = SWAP_LE32(temp - TT.treeinodes);
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292
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293 // Fill out the rest of the superblock.
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294 sb->max_mnt_count=0xFFFF;
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295 sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL));
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296 sb->magic = SWAP_LE32(0xEF53);
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297 sb->state = sb->errors = SWAP_LE16(1);
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298
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299 sb->rev_level = SWAP_LE32(1);
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300 sb->first_ino = SWAP_LE32(INODES_RESERVED+1);
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301 sb->inode_size = SWAP_LE16(sizeof(struct ext2_inode));
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302 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
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303 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
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304
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305 create_uuid(sb->uuid);
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306
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307 // TODO If we're called as mke3fs or mkfs.ext3, do a journal.
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308
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309 //if (strchr(toys.which->name,'3'))
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310 // sb->feature_compat |= SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL);
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311 }
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312
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313 // Does this group contain a superblock backup (and group descriptor table)?
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314 static int is_sb_group(uint32_t group)
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315 {
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316 int i;
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317
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318 // Superblock backups are on groups 0, 1, and powers of 3, 5, and 7.
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319 if(!group || group==1) return 1;
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320 for (i=3; i<9; i+=2) {
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321 int j = i;
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322 while (j<group) j*=i;
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323 if (j==group) return 1;
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324 }
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325 return 0;
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326 }
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327
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328
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329 // Number of blocks used in group by optional superblock/group list backup.
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330 static int group_superblock_overhead(uint32_t group)
104
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331 {
694
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332 int used;
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333
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334 if (!is_sb_group(group)) return 0;
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335
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336 // How many blocks does the group descriptor table take up?
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337 used = TT.groups * sizeof(struct ext2_group);
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338 used += TT.blocksize - 1;
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339 used /= TT.blocksize;
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340 // Plus the superblock itself.
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341 used++;
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342 // And a corner case.
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343 if (!group && TT.blocksize == 1024) used++;
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344
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345 return used;
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346 }
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347
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348 // Number of blocks used in group to store superblock/group/inode list
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349 static int group_overhead(uint32_t group)
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350 {
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351 // Return superblock backup overhead (if any), plus block/inode
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352 // allocation bitmaps, plus inode tables.
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353 return group_superblock_overhead(group) + 2 + get_inodespg(TT.inodespg)
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354 / (TT.blocksize/sizeof(struct ext2_inode));
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355 }
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356
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357 // In bitmap "array" set "len" bits starting at position "start" (from 0).
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358 static void bits_set(char *array, int start, int len)
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359 {
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360 while(len) {
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361 if ((start&7) || len<8) {
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362 array[start/8]|=(1<<(start&7));
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363 start++;
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364 len--;
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365 } else {
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366 array[start/8]=255;
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367 start+=8;
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368 len-=8;
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369 }
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370 }
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371 }
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372
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373 // Seek past len bytes (to maintain sparse file), or write zeroes if output
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374 // not seekable
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375 static void put_zeroes(int len)
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376 {
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377 if(-1 == lseek(TT.fsfd, len, SEEK_SET)) {
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378 memset(toybuf, 0, sizeof(toybuf));
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379 while (len) {
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380 int out = len > sizeof(toybuf) ? sizeof(toybuf) : len;
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381 xwrite(TT.fsfd, toybuf, out);
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382 len -= out;
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383 }
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384 }
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385 }
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386
112
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387 // Fill out an inode structure from struct stat info in dirtree.
237
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388 static void fill_inode(struct ext2_inode *in, struct dirtree *that)
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389 {
694
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390 uint32_t fbu[15];
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391 int temp;
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392
694
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393 file_blocks_used(that->st.st_size, fbu);
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394
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395 // If that inode needs data blocks allocated to it.
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396 if (that->st.st_size) {
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397 int i, group = TT.nextblock/TT.blockbits;
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398
694
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399 // TODO: teach this about indirect blocks.
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400 for (i=0; i<15; i++) {
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401 // If we just jumped into a new group, skip group overhead blocks.
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402 while (group >= TT.nextgroup)
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403 TT.nextblock += group_overhead(TT.nextgroup++);
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404 }
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405 }
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406 // TODO : S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m)
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407 in->mode = SWAP_LE32(that->st.st_mode);
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408
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409 in->uid = SWAP_LE16(that->st.st_uid & 0xFFFF);
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410 in->uid_high = SWAP_LE16(that->st.st_uid >> 16);
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411 in->gid = SWAP_LE16(that->st.st_gid & 0xFFFF);
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412 in->gid_high = SWAP_LE16(that->st.st_gid >> 16);
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413 in->size = SWAP_LE32(that->st.st_size & 0xFFFFFFFF);
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414
694
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415 // Contortions to make the compiler not generate a warning for x>>32
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416 // when x is 32 bits. The optimizer should clean this up.
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417 if (sizeof(that->st.st_size) > 4) temp = 32;
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418 else temp = 0;
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419 if (temp) in->dir_acl = SWAP_LE32(that->st.st_size >> temp);
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420
694
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421 in->atime = SWAP_LE32(that->st.st_atime);
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422 in->ctime = SWAP_LE32(that->st.st_ctime);
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423 in->mtime = SWAP_LE32(that->st.st_mtime);
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424
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425 in->links_count = SWAP_LE16(that->st.st_nlink);
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426 in->blocks = SWAP_LE32(that->st.st_blocks);
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427 // in->faddr
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428 }
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429
143
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430 // Works like an archiver.
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431 // The first argument is the name of the file to create. If it already
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432 // exists, that size will be used.
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433
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25447caf1b4b Change command main() functions to return void, and exit(toys.exitval) from
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434 void mke2fs_main(void)
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f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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435 {
694
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436 int i, temp;
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437 off_t length;
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438 uint32_t usedblocks, usedinodes, dtiblk, dtbblk;
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439 struct dirtree *dti, *dtb;
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440
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441 // Handle command line arguments.
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442
694
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443 if (toys.optargs[1]) {
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444 sscanf(toys.optargs[1], "%u", &TT.blocks);
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445 temp = O_RDWR|O_CREAT;
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446 } else temp = O_RDWR;
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447 if (!TT.reserved_percent) TT.reserved_percent = 5;
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448
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449 // TODO: Check if filesystem is mounted here
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450
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451 // For mke?fs, open file. For gene?fs, create file.
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452 TT.fsfd = xcreate(*toys.optargs, temp, 0777);
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453
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454 // Determine appropriate block size and block count from file length.
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455 // (If no length, default to 4k. They can override it on the cmdline.)
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456
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457 length = fdlength(TT.fsfd);
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458 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096;
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459 TT.blockbits = 8*TT.blocksize;
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460 if (!TT.blocks) TT.blocks = length/TT.blocksize;
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461
694
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462 // Collect gene2fs list or lost+found, calculate requirements.
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4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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463
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464 if (TT.gendir) {
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465 strncpy(toybuf, TT.gendir, sizeof(toybuf));
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466 dti = dirtree_read(toybuf, NULL, NULL);
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467 } else {
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468 dti = xzalloc(sizeof(struct dirtree)+11);
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469 strcpy(dti->name, "lost+found");
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470 dti->st.st_mode = S_IFDIR|0755;
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471 dti->st.st_ctime = dti->st.st_mtime = time(NULL);
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472 }
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473
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474 // Add root directory inode. This is iterated through for when finding
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475 // blocks, but not when finding inodes. The tree's parent pointers don't
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476 // point back into this.
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477
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478 dtb = xzalloc(sizeof(struct dirtree)+1);
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479 dtb->st.st_mode = S_IFDIR|0755;
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480 dtb->st.st_ctime = dtb->st.st_mtime = time(NULL);
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481 dtb->child = dti;
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482
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483 // Figure out how much space is used by preset files
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484 length = check_treesize(dtb, &(dtb->st.st_size));
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485 check_treelinks(dtb);
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486
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487 // Figure out how many total inodes we need.
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488
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489 if (!TT.inodes) {
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490 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
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491 TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
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492 }
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4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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493
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494 // If we're generating a filesystem and have no idea how many blocks it
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495 // needs, start with a minimal guess, find the overhead of that many
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496 // groups, and loop until this is enough groups to store this many blocks.
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497 if (!TT.blocks) TT.groups = (TT.treeblocks/TT.blockbits)+1;
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498 else TT.groups = div_round_up(TT.blocks, TT.blockbits);
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499
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500 for (;;) {
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501 temp = TT.treeblocks;
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502
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503 for (i = 0; i<TT.groups; i++) temp += group_overhead(i);
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505 if (TT.blocks) {
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506 if (TT.blocks < temp) error_exit("Not enough space.\n");
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507 break;
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508 }
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509 if (temp <= TT.groups * TT.blockbits) {
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510 TT.blocks = temp;
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511 break;
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512 }
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513 TT.groups++;
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514 }
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515 TT.freeblocks = TT.blocks - temp;
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516
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517 // Now we know all the TT data, initialize superblock structure.
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518
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519 init_superblock(&TT.sb);
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520
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521 // Start writing. Skip the first 1k to avoid the boot sector (if any).
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522 put_zeroes(1024);
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ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm.
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523
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524 // Loop through block groups, write out each one.
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525 dtiblk = dtbblk = usedblocks = usedinodes = 0;
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526 for (i=0; i<TT.groups; i++) {
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527 struct ext2_inode *in = (struct ext2_inode *)toybuf;
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528 uint32_t start, itable, used, end;
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529 int j, slot;
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4b25264da01b mke2fs: Stopping for dinner. It compiles.
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530
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531 // Where does this group end?
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532 end = TT.blockbits;
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533 if ((i+1)*TT.blockbits > TT.blocks) end = TT.blocks & (TT.blockbits-1);
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
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534
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535 // Blocks used by inode table
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536 itable = (TT.inodespg*sizeof(struct ext2_inode))/TT.blocksize;
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537
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538 // If a superblock goes here, write it out.
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539 start = group_superblock_overhead(i);
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540 if (start) {
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541 struct ext2_group *bg = (struct ext2_group *)toybuf;
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542 int treeblocks = TT.treeblocks, treeinodes = TT.treeinodes;
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543
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544 TT.sb.block_group_nr = SWAP_LE16(i);
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545
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546 // Write superblock and pad it up to block size
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547 xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock));
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548 temp = TT.blocksize - sizeof(struct ext2_superblock);
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549 if (!i && TT.blocksize > 1024) temp -= 1024;
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550 memset(toybuf, 0, TT.blocksize);
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551 xwrite(TT.fsfd, toybuf, temp);
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552
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553 // Loop through groups to write group descriptor table.
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554 for(j=0; j<TT.groups; j++) {
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555
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556 // Figure out what sector this group starts in.
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557 used = group_superblock_overhead(j);
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41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
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558
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559 // Find next array slot in this block (flush block if full).
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560 slot = j % (TT.blocksize/sizeof(struct ext2_group));
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561 if (!slot) {
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562 if (j) xwrite(TT.fsfd, bg, TT.blocksize);
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563 memset(bg, 0, TT.blocksize);
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564 }
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565
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diff changeset
566 // How many free inodes in this group?
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parents: 674
diff changeset
567 temp = TT.inodespg;
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parents: 674
diff changeset
568 if (!i) temp -= INODES_RESERVED;
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
569 if (temp > treeinodes) {
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
570 treeinodes -= temp;
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parents: 674
diff changeset
571 temp = 0;
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parents: 674
diff changeset
572 } else {
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
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diff changeset
573 temp -= treeinodes;
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diff changeset
574 treeinodes = 0;
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 674
diff changeset
575 }
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
576 bg[slot].free_inodes_count = SWAP_LE16(temp);
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
577
694
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
578 // How many free blocks in this group?
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
579 temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2;
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parents: 674
diff changeset
580 temp = end-used-temp;
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parents: 674
diff changeset
581 if (temp > treeblocks) {
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
582 treeblocks -= temp;
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 674
diff changeset
583 temp = 0;
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
584 } else {
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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diff changeset
585 temp -= treeblocks;
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586 treeblocks = 0;
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587 }
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parents: 674
diff changeset
588 bg[slot].free_blocks_count = SWAP_LE32(temp);
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
589
694
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parents: 674
diff changeset
590 // Fill out rest of group structure
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diff changeset
591 used += j*TT.blockbits;
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diff changeset
592 bg[slot].block_bitmap = SWAP_LE32(used++);
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diff changeset
593 bg[slot].inode_bitmap = SWAP_LE32(used++);
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Rob Landley <rob@landley.net>
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diff changeset
594 bg[slot].inode_table = SWAP_LE32(used);
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diff changeset
595 bg[slot].used_dirs_count = 0; // (TODO)
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parents: 674
diff changeset
596 }
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
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diff changeset
597 xwrite(TT.fsfd, bg, TT.blocksize);
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diff changeset
598 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
599
694
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parents: 674
diff changeset
600 // Now write out stuff that every block group has.
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
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parents: 82
diff changeset
601
694
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 674
diff changeset
602 // Write block usage bitmap
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
603
694
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diff changeset
604 start += 2 + itable;
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diff changeset
605 memset(toybuf, 0, TT.blocksize);
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606 bits_set(toybuf, 0, start);
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diff changeset
607 bits_set(toybuf, end, TT.blockbits-end);
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608 temp = TT.treeblocks - usedblocks;
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diff changeset
609 if (temp) {
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diff changeset
610 if (end-start > temp) temp = end-start;
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diff changeset
611 bits_set(toybuf, start, temp);
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612 }
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parents: 674
diff changeset
613 xwrite(TT.fsfd, toybuf, TT.blocksize);
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
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parents: 82
diff changeset
614
694
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diff changeset
615 // Write inode bitmap
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diff changeset
616 memset(toybuf, 0, TT.blocksize);
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diff changeset
617 j = 0;
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618 if (!i) bits_set(toybuf, 0, j = INODES_RESERVED);
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Rob Landley <rob@landley.net>
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diff changeset
619 bits_set(toybuf, TT.inodespg, slot = TT.blockbits-TT.inodespg);
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diff changeset
620 temp = TT.treeinodes - usedinodes;
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diff changeset
621 if (temp) {
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diff changeset
622 if (slot-j > temp) temp = slot-j;
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Rob Landley <rob@landley.net>
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diff changeset
623 bits_set(toybuf, j, temp);
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
624 }
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diff changeset
625 xwrite(TT.fsfd, toybuf, TT.blocksize);
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
626
694
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
627 // Write inode table for this group (TODO)
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parents: 674
diff changeset
628 for (j = 0; j<TT.inodespg; j++) {
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diff changeset
629 slot = j % (TT.blocksize/sizeof(struct ext2_inode));
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diff changeset
630 if (!slot) {
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
631 if (j) xwrite(TT.fsfd, in, TT.blocksize);
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
632 memset(in, 0, TT.blocksize);
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parents: 674
diff changeset
633 }
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
634 if (!i && j<INODES_RESERVED) {
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parents: 674
diff changeset
635 // Write root inode
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Rob Landley <rob@landley.net>
parents: 674
diff changeset
636 if (j == 2) fill_inode(in+slot, dtb);
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parents: 674
diff changeset
637 } else if (dti) {
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parents: 674
diff changeset
638 fill_inode(in+slot, dti);
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diff changeset
639 dti = treenext(dti);
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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diff changeset
640 }
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diff changeset
641 }
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parents: 674
diff changeset
642 xwrite(TT.fsfd, in, TT.blocksize);
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
Rob Landley <rob@landley.net>
parents: 83
diff changeset
643
694
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parents: 674
diff changeset
644 while (dtb) {
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diff changeset
645 // TODO write index data block
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Rob Landley <rob@landley.net>
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diff changeset
646 // TODO write root directory data block
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diff changeset
647 // TODO write directory data block
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diff changeset
648 // TODO write file data block
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parents: 674
diff changeset
649 put_zeroes(TT.blocksize);
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diff changeset
650 start++;
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diff changeset
651 if (start == end) break;
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diff changeset
652 }
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
653 // Write data blocks (TODO)
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
654 put_zeroes((end-start) * TT.blocksize);
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
655 }
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
656 }