Mercurial > hg > toybox
annotate toys/pending/mke2fs.c @ 1037:af1780148f7c draft
Implement ls --color=auto, suggested by Rich Felker.
author | Rob Landley <rob@landley.net> |
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date | Sun, 01 Sep 2013 08:00:41 -0500 |
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1 /* mke2fs.c - Create an ext2 filesystem image. |
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2 * |
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3 * Copyright 2006, 2007 Rob Landley <rob@landley.net> |
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4 |
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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" |
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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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13 |
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14 Create an ext2 filesystem on a block device or filesystem image. |
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15 |
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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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23 |
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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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30 |
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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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35 |
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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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42 |
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43 The [options] are the same as mke2fs. |
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44 |
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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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51 |
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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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55 |
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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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62 |
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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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89 |
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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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101 struct ext2_superblock sb; |
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102 ) |
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104 #define INODES_RESERVED 10 |
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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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110 if (a%b) c++; |
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111 return c; |
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112 } |
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114 // Calculate data blocks plus index blocks needed to hold a file. |
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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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121 // Fill out index blocks in inode. |
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123 if (blocklist) { |
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124 int i; |
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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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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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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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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 |
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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 |
82 | 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. |
76 | 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); |
76 | 269 |
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270 // Fill out blocks_count, r_blocks_count, first_data_block |
76 | 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); |
76 | 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)? |
76 | 281 |
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282 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(TT.blockbits); |
76 | 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); |
76 | 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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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) |
82 | 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) |
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331 { |
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332 int used; |
82 | 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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345 return used; |
82 | 346 } |
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 |
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387 // Fill out an inode structure from struct stat info in dirtree. |
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388 static void fill_inode(struct ext2_inode *in, struct dirtree *that) |
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389 { |
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390 uint32_t fbu[15]; |
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391 int temp; |
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392 |
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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 |
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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 |
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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 |
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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 |
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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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434 void mke2fs_main(void) |
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435 { |
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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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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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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 |
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462 // Collect gene2fs list or lost+found, calculate requirements. |
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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, dirtree_notdotdot); |
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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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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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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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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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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); |
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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; |
82 | 543 |
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544 TT.sb.block_group_nr = SWAP_LE16(i); |
82 | 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); |
82 | 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++) { |
82 | 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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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 } |
82 | 565 |
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566 // How many free inodes in this group? |
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567 temp = TT.inodespg; |
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568 if (!i) temp -= INODES_RESERVED; |
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569 if (temp > treeinodes) { |
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570 treeinodes -= temp; |
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571 temp = 0; |
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572 } else { |
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573 temp -= treeinodes; |
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574 treeinodes = 0; |
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575 } |
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576 bg[slot].free_inodes_count = SWAP_LE16(temp); |
82 | 577 |
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578 // How many free blocks in this group? |
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579 temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2; |
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580 temp = end-used-temp; |
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581 if (temp > treeblocks) { |
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582 treeblocks -= temp; |
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583 temp = 0; |
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584 } else { |
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585 temp -= treeblocks; |
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586 treeblocks = 0; |
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587 } |
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588 bg[slot].free_blocks_count = SWAP_LE32(temp); |
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589 |
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590 // Fill out rest of group structure |
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591 used += j*TT.blockbits; |
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592 bg[slot].block_bitmap = SWAP_LE32(used++); |
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593 bg[slot].inode_bitmap = SWAP_LE32(used++); |
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594 bg[slot].inode_table = SWAP_LE32(used); |
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595 bg[slot].used_dirs_count = 0; // (TODO) |
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596 } |
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597 xwrite(TT.fsfd, bg, TT.blocksize); |
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598 } |
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599 |
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600 // Now write out stuff that every block group has. |
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601 |
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602 // Write block usage bitmap |
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603 |
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604 start += 2 + itable; |
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605 memset(toybuf, 0, TT.blocksize); |
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606 bits_set(toybuf, 0, start); |
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607 bits_set(toybuf, end, TT.blockbits-end); |
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608 temp = TT.treeblocks - usedblocks; |
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609 if (temp) { |
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610 if (end-start > temp) temp = end-start; |
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611 bits_set(toybuf, start, temp); |
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612 } |
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613 xwrite(TT.fsfd, toybuf, TT.blocksize); |
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614 |
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615 // Write inode bitmap |
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616 memset(toybuf, 0, TT.blocksize); |
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617 j = 0; |
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618 if (!i) bits_set(toybuf, 0, j = INODES_RESERVED); |
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619 bits_set(toybuf, TT.inodespg, slot = TT.blockbits-TT.inodespg); |
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620 temp = TT.treeinodes - usedinodes; |
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621 if (temp) { |
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622 if (slot-j > temp) temp = slot-j; |
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623 bits_set(toybuf, j, temp); |
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624 } |
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625 xwrite(TT.fsfd, toybuf, TT.blocksize); |
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626 |
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627 // Write inode table for this group (TODO) |
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628 for (j = 0; j<TT.inodespg; j++) { |
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629 slot = j % (TT.blocksize/sizeof(struct ext2_inode)); |
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630 if (!slot) { |
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631 if (j) xwrite(TT.fsfd, in, TT.blocksize); |
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632 memset(in, 0, TT.blocksize); |
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633 } |
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634 if (!i && j<INODES_RESERVED) { |
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635 // Write root inode |
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636 if (j == 2) fill_inode(in+slot, dtb); |
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637 } else if (dti) { |
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638 fill_inode(in+slot, dti); |
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639 dti = treenext(dti); |
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640 } |
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641 } |
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642 xwrite(TT.fsfd, in, TT.blocksize); |
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This creates an almost valid empty ext2 filesystem, except for a few superblock
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643 |
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644 while (dtb) { |
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645 // TODO write index data block |
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646 // TODO write root directory data block |
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647 // TODO write directory data block |
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648 // TODO write file data block |
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649 put_zeroes(TT.blocksize); |
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650 start++; |
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651 if (start == end) break; |
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652 } |
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653 // Write data blocks (TODO) |
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654 put_zeroes((end-start) * TT.blocksize); |
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655 } |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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656 } |