Mercurial > hg > toybox
annotate toys/mke2fs.c @ 90:7c77c6ec17ee
Add "make defconfig". Modify global options to start with CONFIG_TOYBOX_.
author | Rob Landley <rob@landley.net> |
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date | Wed, 31 Jan 2007 14:37:01 -0500 |
parents | bdbef4ab4ac6 |
children | 4c81e6375719 |
rev | line source |
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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 Rob Landley <rob@landley.net> |
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6 */ |
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7 |
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8 #include "toys.h" |
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9 |
76 | 10 #define TT toy.mke2fs |
11 | |
53
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12 // b - block size (1024, 2048, 4096) |
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13 // F - force (run on mounted device or non-block device) |
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14 // i - bytes per inode |
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15 // N - number of inodes |
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16 // m - reserved blocks percentage |
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17 // n - Don't write |
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18 // q - quiet |
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19 |
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20 // L - volume label |
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21 // M - last mounted path |
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22 // o - creator os |
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23 |
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24 // j - create journal |
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25 // J - journal options (size=1024-102400 blocks,device=) |
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26 // device=/dev/blah or LABEL=label UUID=uuid |
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27 |
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28 // E - extended options (stride=stripe-size blocks) |
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29 // O - none,dir_index,filetype,has_journal,journal_dev,sparse_super |
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30 |
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31 #define INODES_RESERVED 10 |
53
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32 |
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33 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm |
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34 // we should generate a uuid structure by reading a clock with 100 nanosecond |
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35 // precision, normalizing it to the start of the gregorian calendar in 1582, |
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36 // and looking up our eth0 mac address. |
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37 // |
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38 // On the other hand, we have 128 bits to come up with a unique identifier, of |
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39 // which 6 have a defined value. /dev/urandom it is. |
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40 |
82 | 41 static void create_uuid(char *uuid) |
53
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42 { |
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43 // Read 128 random bytes |
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44 int fd = xopen("/dev/urandom", O_RDONLY); |
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45 xreadall(fd, uuid, 16); |
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46 close(fd); |
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47 |
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48 // Claim to be a DCE format UUID. |
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49 uuid[6] = (uuid[6] & 0x0F) | 0x40; |
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50 uuid[8] = (uuid[8] & 0x3F) | 0x80; |
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51 |
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52 // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should |
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53 // set bit 1 of the node ID, which is the mac multicast bit. This means we |
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54 // should never collide with anybody actually using a macaddr. |
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55 uuid[11] = uuid[11] | 128; |
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56 } |
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57 |
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58 // Fill out superblock and TT |
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59 |
82 | 60 static void init_superblock(struct ext2_superblock *sb) |
81
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61 { |
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62 uint32_t temp; |
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63 |
82 | 64 // Set log_block_size and log_frag_size. |
76 | 65 |
82 | 66 for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break; |
67 if (temp==4) error_exit("bad blocksize"); | |
76 | 68 sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp); |
69 | |
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70 // Fill out blocks_count, r_blocks_count, first_data_block |
76 | 71 |
72 sb->blocks_count = SWAP_LE32(TT.blocks); | |
73 | |
74 if (!TT.reserved_percent) TT.reserved_percent = 5; | |
75 temp = (TT.blocks * (uint64_t)TT.reserved_percent) /100; | |
76 sb->r_blocks_count = SWAP_LE32(temp); | |
77 | |
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78 sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0); |
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79 |
76 | 80 // Set blocks_per_group and frags_per_group, which is the size of an |
81 // allocation bitmap that fits in one block (I.E. how many bits per block)? | |
82 | |
83 temp = TT.blocksize*8; | |
84 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(temp); | |
85 | |
79
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86 // How many block groups do we need? (Round up avoiding integer overflow.) |
76 | 87 |
88 TT.groups = (TT.blocks)/temp; | |
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89 if (TT.blocks & (temp-1)) TT.groups++; |
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90 |
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91 // Figure out how many inodes we need. |
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92 |
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93 if (!TT.inodes) { |
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94 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192; |
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95 TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode; |
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96 } |
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97 |
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98 // Figure out inodes per group, rounded up to block size. |
76 | 99 |
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100 // How many blocks of inodes total, rounded up |
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101 temp = TT.inodes / (TT.blocksize/sizeof(struct ext2_inode)); |
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102 if (temp * (TT.blocksize/sizeof(struct ext2_inode)) != TT.inodes) temp++; |
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103 // How many blocks of inodes per group, again rounded up |
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104 TT.inodes = temp / TT.groups; |
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105 if (temp & (TT.groups-1)) TT.inodes++; |
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106 // How many inodes per group is that? |
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107 TT.inodes *= (TT.blocksize/sizeof(struct ext2_inode)); |
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108 |
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109 // Set inodes_per_group and total inodes_count |
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110 sb->inodes_per_group = SWAP_LE32(TT.inodes); |
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111 sb->inodes_count = SWAP_LE32(TT.inodes *= TT.groups); |
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112 |
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113 // Fill out the rest of the superblock. |
76 | 114 sb->max_mnt_count=0xFFFF; |
115 sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL)); | |
116 sb->magic = SWAP_LE32(0xEF53); | |
117 sb->state = sb->errors = SWAP_LE16(1); | |
118 | |
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119 sb->rev_level = SWAP_LE32(1); |
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120 sb->first_ino = SWAP_LE32(INODES_RESERVED+1); |
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121 sb->inode_size = SWAP_LE16(sizeof(struct ext2_inode)); |
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122 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE); |
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123 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER); |
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124 |
76 | 125 create_uuid(sb->uuid); |
126 | |
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127 // TODO If we're called as mke3fs or mkfs.ext3, do a journal. |
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128 |
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129 //if (strchr(toys.which->name,'3')) |
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130 // sb->feature_compat = SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL); |
83
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131 |
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132 // TODO fill out free_blocks, free_inodes, first_ino |
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133 } |
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134 |
82 | 135 // Number of blocks used in this group by superblock/group list backup. |
136 // Returns 0 if this group doesn't have a superblock backup. | |
137 static int group_superblock_used(uint32_t group) | |
138 { | |
83
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139 int used = 0, i; |
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140 |
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141 // Superblock backups are on groups 0, 1, and powers of 3, 5, and 7. |
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142 if(!group || group==1) used++; |
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143 for (i=3; i<9; i+=2) { |
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144 int j = i; |
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145 while (j<group) j*=i; |
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146 if (j==group) used++; |
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147 } |
82 | 148 |
83
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149 if (used) { |
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150 // How blocks does the group table take up? |
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151 used = TT.groups * sizeof(struct ext2_group); |
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152 used += TT.blocksize - 1; |
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153 used /= TT.blocksize; |
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154 // Plus the superblock itself. |
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155 used++; |
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156 // And a corner case. |
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157 if (!group && TT.blocksize == 1024) used++; |
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158 } |
82 | 159 |
160 return used; | |
161 } | |
162 | |
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163 static void bits_set(char *array, int start, int len) |
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164 { |
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165 while(len) { |
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166 if ((start&7) || len<8) { |
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167 array[start/8]|=(1<<(start&7)); |
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168 start++; |
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169 len--; |
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170 } else { |
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171 array[start/8]=255; |
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172 start+=8; |
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173 len-=8; |
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174 } |
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175 } |
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176 } |
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177 |
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178 int mke2fs_main(void) |
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179 { |
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180 int i, temp, blockbits; |
82 | 181 off_t length; |
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182 |
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183 // Handle command line arguments. |
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184 |
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185 if (toys.optargs[1]) { |
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186 sscanf(toys.optargs[1], "%u", &TT.blocks); |
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187 temp = O_RDWR|O_CREAT; |
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188 } else temp = O_RDWR; |
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189 |
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190 // TODO: collect gene2fs list/lost+found, calculate requirements. |
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191 |
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192 // TODO: Check if filesystem is mounted here |
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193 |
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194 // For mke?fs, open file. For gene?fs, create file. |
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195 TT.fsfd = xcreate(*toys.optargs, temp, 0777); |
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196 |
82 | 197 // Determine appropriate block size and block count from file length. |
198 | |
199 length = fdlength(TT.fsfd); | |
200 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096; | |
201 if (!TT.blocks) TT.blocks = length/TT.blocksize; | |
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202 if (!TT.blocks) error_exit("gene2fs is a TODO item"); |
82 | 203 |
204 // Skip the first 1k to avoid the boot sector (if any). Use this to | |
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205 // figure out if this file is seekable. |
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206 if(-1 == lseek(TT.fsfd, 1024, SEEK_SET)) { |
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207 TT.noseek=1; |
82 | 208 xwrite(TT.fsfd, &TT.sb, 1024); |
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209 } |
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210 |
82 | 211 // Initialize superblock structure |
212 | |
213 init_superblock(&TT.sb); | |
83
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214 blockbits = 8*TT.blocksize; |
82 | 215 |
216 // Loop through block groups. | |
217 | |
218 for (i=0; i<TT.groups; i++) { | |
83
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219 struct ext2_inode *in = (struct ext2_inode *)toybuf; |
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220 uint32_t start, itable, used, end; |
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221 int j, slot; |
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222 |
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223 // Where does this group end? |
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224 end = blockbits; |
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225 if ((i+1)*blockbits > TT.blocks) end = TT.blocks & (blockbits-1); |
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226 |
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227 // Blocks used by inode table |
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228 itable = ((TT.inodes/TT.groups)*sizeof(struct ext2_inode))/TT.blocksize; |
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229 |
82 | 230 // If a superblock goes here, write it out. |
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231 start = group_superblock_used(i); |
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232 if (start) { |
82 | 233 struct ext2_group *bg = (struct ext2_group *)toybuf; |
234 | |
235 TT.sb.block_group_nr = SWAP_LE16(i); | |
236 | |
237 // Write superblock and pad it up to block size | |
238 xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock)); | |
239 temp = TT.blocksize - sizeof(struct ext2_superblock); | |
240 if (!i && TT.blocksize > 1024) temp -= 1024; | |
241 memset(toybuf, 0, TT.blocksize); | |
242 xwrite(TT.fsfd, toybuf, temp); | |
243 | |
244 // Loop through groups to write group descriptor table. | |
245 for(j=0; j<TT.groups; j++) { | |
246 | |
247 // Figure out what sector this group starts in. | |
248 used = group_superblock_used(j); | |
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249 |
82 | 250 // Find next array slot in this block (flush block if full). |
83
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251 slot = j % (TT.blocksize/sizeof(struct ext2_group)); |
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252 if (!slot) { |
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253 if (j) xwrite(TT.fsfd, bg, TT.blocksize); |
82 | 254 memset(bg, 0, TT.blocksize); |
255 } | |
256 | |
257 // sb.inodes_per_group is uint32_t, but group.free_inodes_count | |
258 // is uint16_t. Add in endianness conversion and this little | |
259 // dance is called for. | |
260 temp = SWAP_LE32(TT.sb.inodes_per_group); | |
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261 if (!i) temp -= INODES_RESERVED; |
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262 bg[slot].free_inodes_count = SWAP_LE16(temp); |
82 | 263 |
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264 // How many blocks will the inode table use? |
82 | 265 temp *= sizeof(struct ext2_inode); |
266 temp /= TT.blocksize; | |
267 | |
83
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268 // How many does that leave? (TODO: fill it up) |
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269 temp = end-used-temp; |
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270 bg[slot].free_blocks_count = SWAP_LE32(temp); |
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271 |
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272 // Fill out rest of group structure (TODO: gene2fs allocation) |
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273 used += j*blockbits; |
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274 bg[slot].block_bitmap = SWAP_LE32(used++); |
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275 bg[slot].inode_bitmap = SWAP_LE32(used++); |
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276 bg[slot].inode_table = SWAP_LE32(used); |
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277 bg[slot].used_dirs_count = 0; // (TODO) |
82 | 278 } |
83
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279 xwrite(TT.fsfd, bg, TT.blocksize); |
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280 } |
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281 |
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282 // Now write out stuff that every block group has. |
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283 |
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284 // Write block usage bitmap (TODO: fill it) |
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285 |
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286 memset(toybuf, 0, TT.blocksize); |
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287 bits_set(toybuf, 0, start+itable); |
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288 if (end!=blockbits) bits_set(toybuf, end, blockbits-end); |
83
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289 xwrite(TT.fsfd, toybuf, TT.blocksize); |
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290 |
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291 // Write inode bitmap (TODO) |
83
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292 temp = TT.inodes/TT.groups; |
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293 memset(toybuf, 0, TT.blocksize); |
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294 if (!i) bits_set(toybuf, 0, INODES_RESERVED); |
83
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295 bits_set(toybuf, temp, blockbits-temp); |
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296 xwrite(TT.fsfd, toybuf, TT.blocksize); |
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297 |
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298 // Write inode table for this group |
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299 for (j = 0; j<temp; j++) { |
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300 slot = j % (TT.blocksize/sizeof(struct ext2_inode)); |
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301 if (!slot) { |
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302 if (j) xwrite(TT.fsfd, in, TT.blocksize); |
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303 memset(in, 0, TT.blocksize); |
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304 } |
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305 } |
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306 xwrite(TT.fsfd, in, TT.blocksize); |
84
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This creates an almost valid empty ext2 filesystem, except for a few superblock
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307 |
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This creates an almost valid empty ext2 filesystem, except for a few superblock
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308 // Write empty data blocks |
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309 memset(toybuf, 0, TT.blocksize); |
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310 for (j = start; j < end; j++) |
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311 xwrite(TT.fsfd, toybuf, TT.blocksize); |
82 | 312 } |
53
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313 |
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314 return 0; |
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315 } |