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annotate toys/mke2fs.c @ 226:6aac63925eff

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author Rob Landley <rob@landley.net>
date Sat, 05 Jan 2008 18:09:49 -0600
parents 30a6db5a95c2
children d4176f3f3835
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1 /* vi: set ts=4:
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2 *
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3 * mke2fs.c - Create an ext2 filesystem image.
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4 *
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5 * Copyright 2006, 2007 Rob Landley <rob@landley.net>
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6 *
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7 * Not in SUSv3.
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8 */
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9
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10 #include "toys.h"
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11
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12 // Shortcut to our global data structure, since we use it so much.
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13 #define TT toy.mke2fs
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14
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15 #define INODES_RESERVED 10
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16
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17 static uint32_t div_round_up(uint32_t a, uint32_t b)
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18 {
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19 uint32_t c = a/b;
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20
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21 if (a%b) c++;
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22 return c;
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23 }
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24
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25 // Calculate data blocks plus index blocks needed to hold a file.
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27 static uint32_t file_blocks_used(uint64_t size, uint32_t *blocklist)
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28 {
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29 uint32_t dblocks = (uint32_t)((size+(TT.blocksize-1))/TT.blocksize);
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30 uint32_t idx=TT.blocksize/4, iblocks=0, diblocks=0, tiblocks=0;
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32 // Fill out index blocks in inode.
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33
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34 if (blocklist) {
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35 int i;
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36
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37 // Direct index blocks
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38 for (i=0; i<13 && i<dblocks; i++) blocklist[i] = i;
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39 // Singly indirect index blocks
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40 if (dblocks > 13+idx) blocklist[13] = 13+idx;
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41 // Doubly indirect index blocks
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42 idx = 13 + idx + (idx*idx);
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43 if (dblocks > idx) blocklist[14] = idx;
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44
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45 return 0;
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46 }
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47
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48 // Account for direct, singly, doubly, and triply indirect index blocks
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49
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50 if (dblocks > 12) {
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51 iblocks = ((dblocks-13)/idx)+1;
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52 if (iblocks > 1) {
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53 diblocks = ((iblocks-2)/idx)+1;
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54 if (diblocks > 1)
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55 tiblocks = ((diblocks-2)/idx)+1;
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56 }
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57 }
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59 return dblocks + iblocks + diblocks + tiblocks;
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60 }
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61
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62 // Use the parent pointer to iterate through the tree non-recursively.
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63 static struct dirtree *treenext(struct dirtree *this)
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64 {
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65 while (this && !this->next) this = this->parent;
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66 if (this) this = this->next;
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67
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68 return this;
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69 }
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70
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71 // Recursively calculate the number of blocks used by each inode in the tree.
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72 // Returns blocks used by this directory, assigns bytes used to *size.
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73 // Writes total block count to TT.treeblocks and inode count to TT.treeinodes.
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74
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75 static long check_treesize(struct dirtree *this, off_t *size)
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76 {
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77 long blocks;
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78
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79 while (this) {
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80 *size += sizeof(struct ext2_dentry) + strlen(this->name);
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81
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82 if (this->child)
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83 this->st.st_blocks = check_treesize(this->child, &this->st.st_size);
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84 else if (S_ISREG(this->st.st_mode)) {
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85 this->st.st_blocks = file_blocks_used(this->st.st_size, 0);
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86 TT.treeblocks += this->st.st_blocks;
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87 }
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88 this = this->next;
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89 }
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90 TT.treeblocks += blocks = file_blocks_used(*size, 0);
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91 TT.treeinodes++;
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92
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93 return blocks;
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94 }
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95
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96 // Calculate inode numbers and link counts.
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97 //
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98 // To do this right I need to copy the tree and sort it, but here's a really
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99 // ugly n^2 way of dealing with the problem that doesn't scale well to large
112
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100 // numbers of files (> 100,000) but can be done in very little code.
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101 // This rewrites inode numbers to their final values, allocating depth first.
101
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102
112
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103 static void check_treelinks(struct dirtree *tree)
101
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104 {
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105 struct dirtree *this=tree, *that;
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106 long inode = INODES_RESERVED;
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107
112
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108 while (this) {
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109 ++inode;
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110 // Since we can't hardlink to directories, we know their link count.
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111 if (S_ISDIR(this->st.st_mode)) this->st.st_nlink = 2;
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112 else {
112
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113 dev_t new = this->st.st_dev;
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114
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115 if (!new) continue;
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116
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117 this->st.st_nlink = 0;
112
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118 for (that = tree; that; that = treenext(that)) {
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119 if (this->st.st_ino == that->st.st_ino &&
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120 this->st.st_dev == that->st.st_dev)
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121 {
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122 this->st.st_nlink++;
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123 this->st.st_ino = inode;
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124 }
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125 }
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126 }
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127 this->st.st_ino = inode;
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128 this = treenext(this);
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129 }
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130 }
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131
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132 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
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133 // we should generate a uuid structure by reading a clock with 100 nanosecond
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134 // precision, normalizing it to the start of the gregorian calendar in 1582,
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135 // and looking up our eth0 mac address.
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136 //
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137 // On the other hand, we have 128 bits to come up with a unique identifier, of
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138 // which 6 have a defined value. /dev/urandom it is.
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139
143
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140 static void create_uuid(char *uuid)
53
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141 {
99
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142 // Read 128 random bits
53
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143 int fd = xopen("/dev/urandom", O_RDONLY);
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144 xreadall(fd, uuid, 16);
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145 close(fd);
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146
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147 // Claim to be a DCE format UUID.
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148 uuid[6] = (uuid[6] & 0x0F) | 0x40;
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149 uuid[8] = (uuid[8] & 0x3F) | 0x80;
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150
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151 // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should
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152 // set bit 1 of the node ID, which is the mac multicast bit. This means we
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153 // should never collide with anybody actually using a macaddr.
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154 uuid[11] = uuid[11] | 128;
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155 }
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156
112
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157 // Calculate inodes per group from total inodes.
104
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158 static uint32_t get_inodespg(uint32_t inodes)
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159 {
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160 uint32_t temp;
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161
112
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162 // Round up to fill complete inode blocks.
104
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163 temp = (inodes + TT.groups - 1) / TT.groups;
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164 inodes = TT.blocksize/sizeof(struct ext2_inode);
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165 return ((temp + inodes - 1)/inodes)*inodes;
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166 }
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167
112
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168 // Fill out superblock and TT structures.
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169
82
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170 static void init_superblock(struct ext2_superblock *sb)
81
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171 {
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172 uint32_t temp;
53
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173
82
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174 // Set log_block_size and log_frag_size.
76
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175
82
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176 for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break;
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177 if (temp==4) error_exit("bad blocksize");
76
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178 sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp);
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179
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180 // Fill out blocks_count, r_blocks_count, first_data_block
76
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181
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182 sb->blocks_count = SWAP_LE32(TT.blocks);
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183 sb->free_blocks_count = SWAP_LE32(TT.freeblocks);
104
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184 temp = (TT.blocks * (uint64_t)TT.reserved_percent) / 100;
76
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185 sb->r_blocks_count = SWAP_LE32(temp);
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186
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187 sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0);
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188
76
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189 // Set blocks_per_group and frags_per_group, which is the size of an
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190 // allocation bitmap that fits in one block (I.E. how many bits per block)?
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191
104
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192 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(TT.blockbits);
76
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193
79
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194 // Set inodes_per_group and total inodes_count
99
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195 sb->inodes_per_group = SWAP_LE32(TT.inodespg);
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196 sb->inodes_count = SWAP_LE32(TT.inodespg * TT.groups);
79
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197
112
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198 // Determine free inodes.
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199 temp = TT.inodespg*TT.groups - INODES_RESERVED;
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200 if (temp < TT.treeinodes) error_exit("Not enough inodes.\n");
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201 sb->free_inodes_count = SWAP_LE32(temp - TT.treeinodes);
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202
79
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203 // Fill out the rest of the superblock.
76
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204 sb->max_mnt_count=0xFFFF;
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205 sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL));
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206 sb->magic = SWAP_LE32(0xEF53);
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207 sb->state = sb->errors = SWAP_LE16(1);
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208
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209 sb->rev_level = SWAP_LE32(1);
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210 sb->first_ino = SWAP_LE32(INODES_RESERVED+1);
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211 sb->inode_size = SWAP_LE16(sizeof(struct ext2_inode));
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212 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
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213 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
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214
143
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215 create_uuid(sb->uuid);
112
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216
83
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217 // TODO If we're called as mke3fs or mkfs.ext3, do a journal.
53
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218
75
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219 //if (strchr(toys.which->name,'3'))
101
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220 // sb->feature_compat |= SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL);
81
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221 }
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222
104
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223 // Does this group contain a superblock backup (and group descriptor table)?
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224 static int is_sb_group(uint32_t group)
82
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225 {
104
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226 int i;
83
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227
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228 // Superblock backups are on groups 0, 1, and powers of 3, 5, and 7.
104
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229 if(!group || group==1) return 1;
83
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230 for (i=3; i<9; i+=2) {
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231 int j = i;
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232 while (j<group) j*=i;
104
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233 if (j==group) return 1;
83
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234 }
104
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235 return 0;
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236 }
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237
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238
112
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239 // Number of blocks used in group by optional superblock/group list backup.
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240 static int group_superblock_overhead(uint32_t group)
104
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241 {
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242 int used;
82
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243
104
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244 if (!is_sb_group(group)) return 0;
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245
112
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246 // How many blocks does the group descriptor table take up?
104
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247 used = TT.groups * sizeof(struct ext2_group);
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248 used += TT.blocksize - 1;
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249 used /= TT.blocksize;
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250 // Plus the superblock itself.
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251 used++;
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252 // And a corner case.
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253 if (!group && TT.blocksize == 1024) used++;
82
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254
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255 return used;
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256 }
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257
112
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258 // Number of blocks used in group to store superblock/group/inode list
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259 static int group_overhead(uint32_t group)
104
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260 {
112
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261 // Return superblock backup overhead (if any), plus block/inode
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262 // allocation bitmaps, plus inode tables.
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263 return group_superblock_overhead(group) + 2 + get_inodespg(TT.inodespg)
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264 / (TT.blocksize/sizeof(struct ext2_inode));
104
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265 }
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266
112
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267 // In bitmap "array" set "len" bits starting at position "start" (from 0).
83
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diff changeset
268 static void bits_set(char *array, int start, int len)
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269 {
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270 while(len) {
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diff changeset
271 if ((start&7) || len<8) {
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diff changeset
272 array[start/8]|=(1<<(start&7));
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diff changeset
273 start++;
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
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diff changeset
274 len--;
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
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diff changeset
275 } else {
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diff changeset
276 array[start/8]=255;
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diff changeset
277 start+=8;
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
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diff changeset
278 len-=8;
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
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diff changeset
279 }
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diff changeset
280 }
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diff changeset
281 }
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diff changeset
282
99
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283 // Seek past len bytes (to maintain sparse file), or write zeroes if output
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diff changeset
284 // not seekable
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285 static void put_zeroes(int len)
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286 {
112
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287 if(-1 == lseek(TT.fsfd, len, SEEK_SET)) {
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288 memset(toybuf, 0, sizeof(toybuf));
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289 while (len) {
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290 int out = len > sizeof(toybuf) ? sizeof(toybuf) : len;
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291 xwrite(TT.fsfd, toybuf, out);
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292 len -= out;
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293 }
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294 }
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295 }
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296
112
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297 // Fill out an inode structure from struct stat info in dirtree.
99
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298 static void fill_inode(struct ext2_inode *in, struct dirtree *this)
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299 {
112
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300 uint32_t fbu[15];
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301 int temp;
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302
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303 file_blocks_used(this->st.st_size, fbu);
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304
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305 // If this inode needs data blocks allocated to it.
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306 if (this->st.st_size) {
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307 int i, group = TT.nextblock/TT.blockbits;
99
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308
112
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309 // TODO: teach this about indirect blocks.
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310 for (i=0; i<15; i++) {
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311 // If we just jumped into a new group, skip group overhead blocks.
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312 while (group >= TT.nextgroup)
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313 TT.nextblock += group_overhead(TT.nextgroup++);
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314 }
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315 }
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316 // TODO : S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m)
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diff changeset
317 in->mode = SWAP_LE32(this->st.st_mode);
99
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318
112
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diff changeset
319 in->uid = SWAP_LE16(this->st.st_uid & 0xFFFF);
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diff changeset
320 in->uid_high = SWAP_LE16(this->st.st_uid >> 16);
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321 in->gid = SWAP_LE16(this->st.st_gid & 0xFFFF);
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322 in->gid_high = SWAP_LE16(this->st.st_gid >> 16);
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323 in->size = SWAP_LE32(this->st.st_size & 0xFFFFFFFF);
99
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diff changeset
324
112
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diff changeset
325 // Contortions to make the compiler not generate a warning for x>>32
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diff changeset
326 // when x is 32 bits. The optimizer should clean this up.
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diff changeset
327 if (sizeof(this->st.st_size) > 4) temp = 32;
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diff changeset
328 else temp = 0;
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diff changeset
329 if (temp) in->dir_acl = SWAP_LE32(this->st.st_size >> temp);
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diff changeset
330
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331 in->atime = SWAP_LE32(this->st.st_atime);
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332 in->ctime = SWAP_LE32(this->st.st_ctime);
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333 in->mtime = SWAP_LE32(this->st.st_mtime);
99
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diff changeset
334
112
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335 in->links_count = SWAP_LE16(this->st.st_nlink);
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336 in->blocks = SWAP_LE32(this->st.st_blocks);
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337 // in->faddr
99
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338 }
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339
143
9cbb323f297f Break out dirtree.c and let it call a function instead of returning the data.
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diff changeset
340 // Works like an archiver.
9cbb323f297f Break out dirtree.c and let it call a function instead of returning the data.
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diff changeset
341 // The first argument is the name of the file to create. If it already
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diff changeset
342 // exists, that size will be used.
9cbb323f297f Break out dirtree.c and let it call a function instead of returning the data.
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diff changeset
343
186
25447caf1b4b Change command main() functions to return void, and exit(toys.exitval) from
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diff changeset
344 void mke2fs_main(void)
81
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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diff changeset
345 {
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
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diff changeset
346 int i, temp;
82
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diff changeset
347 off_t length;
112
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348 uint32_t usedblocks, usedinodes, dtiblk, dtbblk;
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349 struct dirtree *dti, *dtb;
143
9cbb323f297f Break out dirtree.c and let it call a function instead of returning the data.
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diff changeset
350
81
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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diff changeset
351 // Handle command line arguments.
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diff changeset
352
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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diff changeset
353 if (toys.optargs[1]) {
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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diff changeset
354 sscanf(toys.optargs[1], "%u", &TT.blocks);
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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diff changeset
355 temp = O_RDWR|O_CREAT;
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from
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diff changeset
356 } else temp = O_RDWR;
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
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diff changeset
357 if (!TT.reserved_percent) TT.reserved_percent = 5;
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diff changeset
358
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diff changeset
359 // TODO: Check if filesystem is mounted here
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diff changeset
360
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
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diff changeset
361 // For mke?fs, open file. For gene?fs, create file.
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diff changeset
362 TT.fsfd = xcreate(*toys.optargs, temp, 0777);
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diff changeset
363
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
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diff changeset
364 // Determine appropriate block size and block count from file length.
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diff changeset
365 // (If no length, default to 4k. They can override it on the cmdline.)
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diff changeset
366
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
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diff changeset
367 length = fdlength(TT.fsfd);
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diff changeset
368 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096;
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diff changeset
369 TT.blockbits = 8*TT.blocksize;
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diff changeset
370 if (!TT.blocks) TT.blocks = length/TT.blocksize;
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diff changeset
371
97
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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diff changeset
372 // Collect gene2fs list or lost+found, calculate requirements.
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diff changeset
373
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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diff changeset
374 if (TT.gendir) {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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diff changeset
375 strncpy(toybuf, TT.gendir, sizeof(toybuf));
143
9cbb323f297f Break out dirtree.c and let it call a function instead of returning the data.
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parents: 112
diff changeset
376 dti = dirtree_read(toybuf, NULL, NULL);
97
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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diff changeset
377 } else {
112
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diff changeset
378 dti = xzalloc(sizeof(struct dirtree)+11);
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diff changeset
379 strcpy(dti->name, "lost+found");
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diff changeset
380 dti->st.st_mode = S_IFDIR|0755;
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381 dti->st.st_ctime = dti->st.st_mtime = time(NULL);
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diff changeset
382 }
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diff changeset
383
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diff changeset
384 // Add root directory inode. This is iterated through for when finding
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diff changeset
385 // blocks, but not when finding inodes. The tree's parent pointers don't
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diff changeset
386 // point back into this.
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diff changeset
387
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diff changeset
388 dtb = xzalloc(sizeof(struct dirtree)+1);
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diff changeset
389 dtb->st.st_mode = S_IFDIR|0755;
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diff changeset
390 dtb->st.st_ctime = dtb->st.st_mtime = time(NULL);
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diff changeset
391 dtb->child = dti;
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diff changeset
392
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diff changeset
393 // Figure out how much space is used by preset files
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diff changeset
394 length = check_treesize(dtb, &(dtb->st.st_size));
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diff changeset
395 check_treelinks(dtb);
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diff changeset
396
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diff changeset
397 // Figure out how many total inodes we need.
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diff changeset
398
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diff changeset
399 if (!TT.inodes) {
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diff changeset
400 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
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diff changeset
401 TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
97
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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diff changeset
402 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count
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parents: 84
diff changeset
403
112
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diff changeset
404 // If we're generating a filesystem and have no idea how many blocks it
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parents: 105
diff changeset
405 // needs, start with a minimal guess, find the overhead of that many
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diff changeset
406 // groups, and loop until this is enough groups to store this many blocks.
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diff changeset
407 if (!TT.blocks) TT.groups = (TT.treeblocks/TT.blockbits)+1;
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diff changeset
408 else TT.groups = div_round_up(TT.blocks, TT.blockbits);
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diff changeset
409
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diff changeset
410 for (;;) {
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diff changeset
411 temp = TT.treeblocks;
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diff changeset
412
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Rob Landley <rob@landley.net>
parents: 105
diff changeset
413 for (i = 0; i<TT.groups; i++) temp += group_overhead(i);
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
414
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
415 if (TT.blocks) {
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
416 if (TT.blocks < temp) error_exit("Not enough space.\n");
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
417 break;
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
418 }
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
419 if (temp <= TT.groups * TT.blockbits) {
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
420 TT.blocks = temp;
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
421 break;
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
422 }
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
423 TT.groups++;
99
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot...
Rob Landley <rob@landley.net>
parents: 97
diff changeset
424 }
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
425 TT.freeblocks = TT.blocks - temp;
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
426
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
427 // Now we know all the TT data, initialize superblock structure.
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
428
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
429 init_superblock(&TT.sb);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
430
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
431 // Start writing. Skip the first 1k to avoid the boot sector (if any).
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
432 put_zeroes(1024);
101
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm.
Rob Landley <rob@landley.net>
parents: 99
diff changeset
433
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
434 // Loop through block groups, write out each one.
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
435 dtiblk = dtbblk = usedblocks = usedinodes = 0;
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
436 for (i=0; i<TT.groups; i++) {
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
437 struct ext2_inode *in = (struct ext2_inode *)toybuf;
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
Rob Landley <rob@landley.net>
parents: 83
diff changeset
438 uint32_t start, itable, used, end;
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
439 int j, slot;
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
440
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
Rob Landley <rob@landley.net>
parents: 83
diff changeset
441 // Where does this group end?
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
442 end = TT.blockbits;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
443 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
Rob Landley <rob@landley.net>
parents: 83
diff changeset
444
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
Rob Landley <rob@landley.net>
parents: 83
diff changeset
445 // Blocks used by inode table
99
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot...
Rob Landley <rob@landley.net>
parents: 97
diff changeset
446 itable = (TT.inodespg*sizeof(struct ext2_inode))/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
447
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
448 // If a superblock goes here, write it out.
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
449 start = group_superblock_overhead(i);
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
450 if (start) {
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
451 struct ext2_group *bg = (struct ext2_group *)toybuf;
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
452 int treeblocks = TT.treeblocks, treeinodes = TT.treeinodes;
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
453
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
454 TT.sb.block_group_nr = SWAP_LE16(i);
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
455
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
456 // Write superblock and pad it up to block size
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
457 xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock));
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
458 temp = TT.blocksize - sizeof(struct ext2_superblock);
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
459 if (!i && TT.blocksize > 1024) temp -= 1024;
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
460 memset(toybuf, 0, TT.blocksize);
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
461 xwrite(TT.fsfd, toybuf, temp);
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
462
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
463 // Loop through groups to write group descriptor table.
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
464 for(j=0; j<TT.groups; j++) {
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
465
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
466 // Figure out what sector this group starts in.
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
467 used = group_superblock_overhead(j);
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
468
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
469 // Find next array slot in this block (flush block if full).
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
470 slot = j % (TT.blocksize/sizeof(struct ext2_group));
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
471 if (!slot) {
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
472 if (j) xwrite(TT.fsfd, bg, TT.blocksize);
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
473 memset(bg, 0, TT.blocksize);
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
474 }
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
475
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
476 // How many free inodes in this group?
99
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot...
Rob Landley <rob@landley.net>
parents: 97
diff changeset
477 temp = TT.inodespg;
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
Rob Landley <rob@landley.net>
parents: 83
diff changeset
478 if (!i) temp -= INODES_RESERVED;
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
479 if (temp > treeinodes) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
480 treeinodes -= temp;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
481 temp = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
482 } else {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
483 temp -= treeinodes;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
484 treeinodes = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
485 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
486 bg[slot].free_inodes_count = SWAP_LE16(temp);
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
487
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
488 // How many free blocks in this group?
99
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot...
Rob Landley <rob@landley.net>
parents: 97
diff changeset
489 temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2;
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
Rob Landley <rob@landley.net>
parents: 83
diff changeset
490 temp = end-used-temp;
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
491 if (temp > treeblocks) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
492 treeblocks -= temp;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
493 temp = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
494 } else {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
495 temp -= treeblocks;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
496 treeblocks = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
497 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
498 bg[slot].free_blocks_count = SWAP_LE32(temp);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
499
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
500 // Fill out rest of group structure
104
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles,
Rob Landley <rob@landley.net>
parents: 101
diff changeset
501 used += j*TT.blockbits;
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
502 bg[slot].block_bitmap = SWAP_LE32(used++);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
503 bg[slot].inode_bitmap = SWAP_LE32(used++);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
504 bg[slot].inode_table = SWAP_LE32(used);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
505 bg[slot].used_dirs_count = 0; // (TODO)
82
612c8d6c2829 More work on mke2fs.
Rob Landley <rob@landley.net>
parents: 81
diff changeset
506 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
507 xwrite(TT.fsfd, bg, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
508 }
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
509
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
510 // Now write out stuff that every block group has.
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
511
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
512 // Write block usage bitmap
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
513
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
514 start += 2 + itable;
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
515 memset(toybuf, 0, TT.blocksize);
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
516 bits_set(toybuf, 0, start);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
517 bits_set(toybuf, end, TT.blockbits-end);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
518 temp = TT.treeblocks - usedblocks;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
519 if (temp) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
520 if (end-start > temp) temp = end-start;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
521 bits_set(toybuf, start, temp);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
522 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
523 xwrite(TT.fsfd, toybuf, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
524
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
525 // Write inode bitmap
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
526 memset(toybuf, 0, TT.blocksize);
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
527 j = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
528 if (!i) bits_set(toybuf, 0, j = INODES_RESERVED);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
529 bits_set(toybuf, TT.inodespg, slot = TT.blockbits-TT.inodespg);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
530 temp = TT.treeinodes - usedinodes;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
531 if (temp) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
532 if (slot-j > temp) temp = slot-j;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
533 bits_set(toybuf, j, temp);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
534 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
535 xwrite(TT.fsfd, toybuf, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
536
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
537 // Write inode table for this group (TODO)
99
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot...
Rob Landley <rob@landley.net>
parents: 97
diff changeset
538 for (j = 0; j<TT.inodespg; j++) {
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
539 slot = j % (TT.blocksize/sizeof(struct ext2_inode));
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
540 if (!slot) {
105
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps.
Rob Landley <rob@landley.net>
parents: 104
diff changeset
541 if (j) xwrite(TT.fsfd, in, TT.blocksize);
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
542 memset(in, 0, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
543 }
112
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
544 if (!i && j<INODES_RESERVED) {
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
545 // Write root inode
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
546 if (j == 2) fill_inode(in+slot, dtb);
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
547 } else if (dti) {
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
548 fill_inode(in+slot, dti);
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
549 dti = treenext(dti);
aadd28817955 Next iteration of mke2fs development.
Rob Landley <rob@landley.net>
parents: 105
diff changeset
550 }
83
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
diff changeset
551 }
4b25264da01b mke2fs: Stopping for dinner. It compiles.
Rob Landley <rob@landley.net>
parents: 82
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552 xwrite(TT.fsfd, in, TT.blocksize);
84
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock
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553
112
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554 while (dtb) {
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555 // TODO write index data block
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556 // TODO write root directory data block
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557 // TODO write directory data block
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558 // TODO write file data block
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559 put_zeroes(TT.blocksize);
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560 start++;
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561 if (start == end) break;
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562 }
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563 // Write data blocks (TODO)
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97d717829ff0 More work on mke2fs.c. Random in-progress snapshot...
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564 put_zeroes((end-start) * TT.blocksize);
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612c8d6c2829 More work on mke2fs.
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565 }
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41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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566 }
112
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567
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568 // Scratch pad:
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569 // b - block size (1024, 2048, 4096)
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570 // F - force (run on mounted device or non-block device)
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571 // i - bytes per inode
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572 // N - number of inodes
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573 // m - reserved blocks percentage
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574 // n - Don't write
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575 // q - quiet
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576
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577 // L - volume label
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578 // M - last mounted path
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579 // o - creator os
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580
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581 // j - create journal
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582 // J - journal options (size=1024-102400 blocks,device=)
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583 // device=/dev/blah or LABEL=label UUID=uuid
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584
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585 // E - extended options (stride=stripe-size blocks)
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586 // O - none,dir_index,filetype,has_journal,journal_dev,sparse_super
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587
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588