Mercurial > hg > toybox
annotate toys/mke2fs.c @ 101:ff85a83e7d7e
Calculate st_nlink for each node, via a small but n^2 algorithm.
author | Rob Landley <rob@landley.net> |
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date | Wed, 14 Feb 2007 02:20:37 -0500 |
parents | 97d717829ff0 |
children | 1c2f6d2e25de |
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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 | |
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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 |
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32 |
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33 // Calculate data blocks plus index blocks needed to hold a file. |
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34 |
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35 static uint32_t count_blocks_used(uint64_t size) |
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36 { |
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37 uint32_t dblocks = (uint32_t)((size+(TT.blocksize-1))/TT.blocksize); |
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38 uint32_t idx=TT.blocksize/4, iblocks=0, diblocks=0, tiblocks=0; |
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39 |
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40 // Account for direct, singly, doubly, and triply indirect index blocks |
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41 |
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42 if (dblocks > 12) { |
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43 iblocks = ((dblocks-13)/idx)+1; |
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44 if (iblocks > 1) { |
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45 diblocks = ((iblocks-2)/idx)+1; |
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46 if (diblocks > 1) |
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47 tiblocks = ((diblocks-2)/idx)+1; |
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48 } |
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49 } |
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50 |
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51 return dblocks + iblocks + diblocks + tiblocks; |
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52 } |
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53 |
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54 // Calculate the number of blocks used by each inode. Returns blocks used, |
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55 // assigns bytes used to *size. Writes total block count to TT.treeblocks |
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56 // and inode count to TT.treeinodes. |
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57 |
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58 long check_treesize(struct dirtree *this, off_t *size) |
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59 { |
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60 long blocks; |
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61 |
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62 while (this) { |
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63 *size += sizeof(struct ext2_dentry) + strlen(this->name); |
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64 |
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65 if (this->child) |
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66 this->st.st_blocks = check_treesize(this->child, &this->st.st_size); |
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67 else if (S_ISREG(this->st.st_mode)) { |
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68 this->st.st_blocks = count_blocks_used(this->st.st_size); |
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69 TT.treeblocks += this->st.st_blocks; |
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70 } |
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71 this = this->next; |
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72 } |
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73 TT.treeblocks += blocks = count_blocks_used(*size); |
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74 TT.treeinodes++; |
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75 |
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76 return blocks; |
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77 } |
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78 |
101
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79 // Use the parent pointer to iterate through the tree non-recursively. |
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80 static struct dirtree *treenext(struct dirtree *this) |
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81 { |
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82 while (this && !this->next) this = this->parent; |
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83 if (this) this = this->next; |
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84 |
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85 return this; |
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86 } |
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87 |
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88 // To do this right I need to copy the tree and sort it, but here's a really |
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89 // ugly n^2 way of dealing with the problem that doesn't scale well to large |
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90 // numbers of files but can be done in very little code. |
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91 |
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92 static void check_treelinks(void) |
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93 { |
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94 struct dirtree *this, *that; |
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95 |
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96 for (this = TT.dt; this; this = treenext(this)) { |
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97 this->st.st_nlink = 0; |
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98 for (that = TT.dt; that; that = treenext(that)) |
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99 if (this->st.st_ino == that->st.st_ino) |
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100 if (this->st.st_dev == that->st.st_dev) |
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101 this->st.st_nlink++; |
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102 } |
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103 } |
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104 |
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105 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm |
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106 // we should generate a uuid structure by reading a clock with 100 nanosecond |
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107 // precision, normalizing it to the start of the gregorian calendar in 1582, |
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108 // and looking up our eth0 mac address. |
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109 // |
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110 // On the other hand, we have 128 bits to come up with a unique identifier, of |
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111 // which 6 have a defined value. /dev/urandom it is. |
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112 |
82 | 113 static void create_uuid(char *uuid) |
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114 { |
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115 // Read 128 random bits |
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116 int fd = xopen("/dev/urandom", O_RDONLY); |
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117 xreadall(fd, uuid, 16); |
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118 close(fd); |
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119 |
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120 // Claim to be a DCE format UUID. |
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121 uuid[6] = (uuid[6] & 0x0F) | 0x40; |
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122 uuid[8] = (uuid[8] & 0x3F) | 0x80; |
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123 |
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124 // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should |
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125 // set bit 1 of the node ID, which is the mac multicast bit. This means we |
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126 // should never collide with anybody actually using a macaddr. |
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127 uuid[11] = uuid[11] | 128; |
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128 } |
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129 |
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130 // Fill out superblock and TT |
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131 |
82 | 132 static void init_superblock(struct ext2_superblock *sb) |
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133 { |
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134 uint32_t temp; |
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135 |
82 | 136 // Set log_block_size and log_frag_size. |
76 | 137 |
82 | 138 for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break; |
139 if (temp==4) error_exit("bad blocksize"); | |
76 | 140 sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp); |
141 | |
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142 // Fill out blocks_count, r_blocks_count, first_data_block |
76 | 143 |
144 sb->blocks_count = SWAP_LE32(TT.blocks); | |
145 if (!TT.reserved_percent) TT.reserved_percent = 5; | |
146 temp = (TT.blocks * (uint64_t)TT.reserved_percent) /100; | |
147 sb->r_blocks_count = SWAP_LE32(temp); | |
148 | |
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149 sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0); |
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150 |
76 | 151 // Set blocks_per_group and frags_per_group, which is the size of an |
152 // allocation bitmap that fits in one block (I.E. how many bits per block)? | |
153 | |
154 temp = TT.blocksize*8; | |
155 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(temp); | |
156 | |
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157 // How many block groups do we need? (Round up avoiding integer overflow.) |
76 | 158 |
159 TT.groups = (TT.blocks)/temp; | |
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160 if (TT.blocks & (temp-1)) TT.groups++; |
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161 |
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162 // Figure out how many total inodes we need. |
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163 |
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164 if (!TT.inodespg) { |
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165 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192; |
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166 TT.inodespg = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode; |
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167 } |
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168 |
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169 // Figure out inodes per group, rounded up to block size. |
76 | 170 |
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171 // How many blocks of inodes total, rounded up |
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172 temp = TT.inodespg / (TT.blocksize/sizeof(struct ext2_inode)); |
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173 if (temp * (TT.blocksize/sizeof(struct ext2_inode)) != TT.inodespg) temp++; |
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174 // How many blocks of inodes per group, again rounded up |
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175 TT.inodespg = temp / TT.groups; |
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176 if (temp & (TT.groups-1)) TT.inodespg++; |
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177 // How many inodes per group is that? |
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178 TT.inodespg *= (TT.blocksize/sizeof(struct ext2_inode)); |
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179 |
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180 // Set inodes_per_group and total inodes_count |
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181 sb->inodes_per_group = SWAP_LE32(TT.inodespg); |
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182 sb->inodes_count = SWAP_LE32(TT.inodespg * TT.groups); |
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183 |
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184 // Fill out the rest of the superblock. |
76 | 185 sb->max_mnt_count=0xFFFF; |
186 sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL)); | |
187 sb->magic = SWAP_LE32(0xEF53); | |
188 sb->state = sb->errors = SWAP_LE16(1); | |
189 | |
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190 sb->rev_level = SWAP_LE32(1); |
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191 sb->first_ino = SWAP_LE32(INODES_RESERVED+1); |
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192 sb->inode_size = SWAP_LE16(sizeof(struct ext2_inode)); |
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193 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE); |
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194 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER); |
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195 |
76 | 196 create_uuid(sb->uuid); |
197 | |
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198 // TODO If we're called as mke3fs or mkfs.ext3, do a journal. |
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199 |
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200 //if (strchr(toys.which->name,'3')) |
101
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201 // sb->feature_compat |= SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL); |
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202 } |
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203 |
82 | 204 // Number of blocks used in this group by superblock/group list backup. |
205 // Returns 0 if this group doesn't have a superblock backup. | |
206 static int group_superblock_used(uint32_t group) | |
207 { | |
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208 int used = 0, i; |
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209 |
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210 // Superblock backups are on groups 0, 1, and powers of 3, 5, and 7. |
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211 if(!group || group==1) used++; |
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212 for (i=3; i<9; i+=2) { |
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213 int j = i; |
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214 while (j<group) j*=i; |
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215 if (j==group) used++; |
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216 } |
82 | 217 |
83
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218 if (used) { |
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219 // How blocks does the group table take up? |
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220 used = TT.groups * sizeof(struct ext2_group); |
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221 used += TT.blocksize - 1; |
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222 used /= TT.blocksize; |
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223 // Plus the superblock itself. |
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224 used++; |
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225 // And a corner case. |
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226 if (!group && TT.blocksize == 1024) used++; |
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227 } |
82 | 228 |
229 return used; | |
230 } | |
231 | |
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232 static void bits_set(char *array, int start, int len) |
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233 { |
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234 while(len) { |
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235 if ((start&7) || len<8) { |
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236 array[start/8]|=(1<<(start&7)); |
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237 start++; |
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238 len--; |
83
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239 } else { |
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240 array[start/8]=255; |
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241 start+=8; |
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242 len-=8; |
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243 } |
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244 } |
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245 } |
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246 |
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247 // Seek past len bytes (to maintain sparse file), or write zeroes if output |
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248 // not seekable |
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249 static void put_zeroes(int len) |
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250 { |
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251 if(TT.noseek || -1 == lseek(TT.fsfd, len, SEEK_SET)) { |
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252 |
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253 TT.noseek=1; |
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254 memset(toybuf, 0, sizeof(toybuf)); |
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255 while (len) { |
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256 int out = len > sizeof(toybuf) ? sizeof(toybuf) : len; |
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257 xwrite(TT.fsfd, toybuf, out); |
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258 len -= out; |
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259 } |
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260 } |
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261 } |
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262 |
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263 static void fill_inode(struct ext2_inode *in, struct dirtree *this) |
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264 { |
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265 memset(in,0,sizeof(struct ext2_inode)); |
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266 |
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267 // This works on Linux. S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m) |
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268 in->mode = this->st.st_mode; |
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269 |
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270 in->uid = this->st.st_uid & 0xFFFF; |
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271 in->uid_high = this->st.st_uid >> 16; |
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272 in->gid = this->st.st_gid & 0xFFFF; |
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273 in->gid_high = this->st.st_gid >> 16; |
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274 in->size = this->st.st_size & 0xFFFFFFFF; |
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275 |
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276 in->atime = this->st.st_atime; |
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277 in->ctime = this->st.st_ctime; |
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278 in->mtime = this->st.st_mtime; |
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279 |
101
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280 in->links_count = this->st.st_nlink; |
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281 in->blocks = this->st.st_blocks; |
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282 } |
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283 |
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284 int mke2fs_main(void) |
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285 { |
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286 int i, temp, blockbits; |
82 | 287 off_t length; |
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288 |
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289 // Handle command line arguments. |
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290 |
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291 if (toys.optargs[1]) { |
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292 sscanf(toys.optargs[1], "%u", &TT.blocks); |
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293 temp = O_RDWR|O_CREAT; |
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294 } else temp = O_RDWR; |
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295 |
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296 // Collect gene2fs list or lost+found, calculate requirements. |
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297 |
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298 if (TT.gendir) { |
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299 strncpy(toybuf, TT.gendir, sizeof(toybuf)); |
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300 TT.dt = read_dirtree(toybuf, NULL); |
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301 } else { |
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302 TT.dt = xzalloc(sizeof(struct dirtree)+11); |
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303 strcpy(TT.dt->name, "lost+found"); |
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304 TT.dt->st.st_mode = S_IFDIR|0755; |
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305 TT.dt->st.st_ctime = TT.dt->st.st_mtime = time(NULL); |
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306 } |
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307 |
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308 // TODO: Check if filesystem is mounted here |
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309 |
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310 // For mke?fs, open file. For gene?fs, create file. |
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311 TT.fsfd = xcreate(*toys.optargs, temp, 0777); |
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312 |
82 | 313 // Determine appropriate block size and block count from file length. |
314 | |
315 length = fdlength(TT.fsfd); | |
316 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096; | |
317 if (!TT.blocks) TT.blocks = length/TT.blocksize; | |
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318 if (!TT.blocks) error_exit("gene2fs is a TODO item"); |
82 | 319 |
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320 // Skip the first 1k to avoid the boot sector (if any), then |
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321 // initialize superblock structure |
82 | 322 |
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323 put_zeroes(1024); |
82 | 324 init_superblock(&TT.sb); |
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325 blockbits = 8*TT.blocksize; |
82 | 326 |
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327 // Figure out how much space is used |
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328 length = 0; |
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329 length = check_treesize(TT.dt, &length); |
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330 for (temp=i=0; i<TT.groups; i++) { |
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331 temp += group_superblock_used(i) + 2; |
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332 temp += TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)); |
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333 } |
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334 TT.sb.free_blocks_count = SWAP_LE32(TT.blocks - TT.treeblocks - temp); |
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335 TT.sb.free_inodes_count = SWAP_LE32(TT.inodespg*TT.groups - INODES_RESERVED |
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336 - TT.treeinodes); |
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337 |
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338 // Calculate st_nlink for each node in tree. |
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339 |
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340 check_treelinks(); |
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341 |
82 | 342 // Loop through block groups. |
343 | |
344 for (i=0; i<TT.groups; i++) { | |
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345 struct ext2_inode *in = (struct ext2_inode *)toybuf; |
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346 uint32_t start, itable, used, end; |
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347 int j, slot; |
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348 |
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349 // Where does this group end? |
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350 end = blockbits; |
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351 if ((i+1)*blockbits > TT.blocks) end = TT.blocks & (blockbits-1); |
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352 |
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353 // Blocks used by inode table |
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354 itable = (TT.inodespg*sizeof(struct ext2_inode))/TT.blocksize; |
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355 |
82 | 356 // If a superblock goes here, write it out. |
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357 start = group_superblock_used(i); |
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358 if (start) { |
82 | 359 struct ext2_group *bg = (struct ext2_group *)toybuf; |
360 | |
361 TT.sb.block_group_nr = SWAP_LE16(i); | |
362 | |
363 // Write superblock and pad it up to block size | |
364 xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock)); | |
365 temp = TT.blocksize - sizeof(struct ext2_superblock); | |
366 if (!i && TT.blocksize > 1024) temp -= 1024; | |
367 memset(toybuf, 0, TT.blocksize); | |
368 xwrite(TT.fsfd, toybuf, temp); | |
369 | |
370 // Loop through groups to write group descriptor table. | |
371 for(j=0; j<TT.groups; j++) { | |
372 | |
373 // Figure out what sector this group starts in. | |
374 used = group_superblock_used(j); | |
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375 |
82 | 376 // Find next array slot in this block (flush block if full). |
83
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377 slot = j % (TT.blocksize/sizeof(struct ext2_group)); |
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378 if (!slot) { |
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379 if (j) xwrite(TT.fsfd, bg, TT.blocksize); |
82 | 380 memset(bg, 0, TT.blocksize); |
381 } | |
382 | |
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383 // How many free inodes in this group? (TODO) |
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384 temp = TT.inodespg; |
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385 if (!i) temp -= INODES_RESERVED; |
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386 bg[slot].free_inodes_count = SWAP_LE16(temp); |
82 | 387 |
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388 // How many free blocks in this group? (TODO) |
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389 temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2; |
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390 temp = end-used-temp; |
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391 bg[slot].free_blocks_count = SWAP_LE32(temp); |
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392 |
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393 // Fill out rest of group structure (TODO: gene2fs allocation) |
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394 used += j*blockbits; |
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395 bg[slot].block_bitmap = SWAP_LE32(used++); |
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396 bg[slot].inode_bitmap = SWAP_LE32(used++); |
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397 bg[slot].inode_table = SWAP_LE32(used); |
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398 bg[slot].used_dirs_count = 0; // (TODO) |
82 | 399 } |
83
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400 xwrite(TT.fsfd, bg, TT.blocksize); |
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401 } |
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402 |
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403 // Now write out stuff that every block group has. |
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404 |
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405 // Write block usage bitmap (TODO: fill it) |
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406 |
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407 memset(toybuf, 0, TT.blocksize); |
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408 bits_set(toybuf, 0, start+itable); |
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409 if (end!=blockbits) bits_set(toybuf, end, blockbits-end); |
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410 xwrite(TT.fsfd, toybuf, TT.blocksize); |
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411 |
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412 // Write inode bitmap (TODO) |
83
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413 memset(toybuf, 0, TT.blocksize); |
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414 if (!i) bits_set(toybuf, 0, INODES_RESERVED); |
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415 bits_set(toybuf, TT.inodespg, blockbits-TT.inodespg); |
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416 xwrite(TT.fsfd, toybuf, TT.blocksize); |
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417 |
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418 start += 3; |
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419 |
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420 // Write inode table for this group |
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421 for (j = 0; j<TT.inodespg; j++) { |
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422 slot = j % (TT.blocksize/sizeof(struct ext2_inode)); |
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423 if (!slot) { |
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424 if (j) { |
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425 xwrite(TT.fsfd, in, TT.blocksize); |
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426 start++; |
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427 } |
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428 memset(in, 0, TT.blocksize); |
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429 } |
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430 } |
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431 xwrite(TT.fsfd, in, TT.blocksize); |
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432 |
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433 // Write empty data blocks |
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434 put_zeroes((end-start) * TT.blocksize); |
82 | 435 } |
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436 |
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437 return 0; |
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438 } |