Mercurial > hg > toybox
annotate toys/mke2fs.c @ 76:e6332139adae
More work on mke2fs.
author | Rob Landley <rob@landley.net> |
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date | Tue, 23 Jan 2007 19:54:01 -0500 |
parents | 89ca591a9236 |
children | 1aff4181427b |
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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 |
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32 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm |
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33 // we should generate a uuid structure by reading a clock with 100 nanosecond |
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34 // precision, normalizing it to the start of the gregorian calendar in 1582, |
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35 // and looking up our eth0 mac address. |
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36 // |
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37 // On the other hand, we have 128 bits to come up with a unique identifier, of |
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38 // which 6 have a defined value. /dev/urandom it is. |
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39 |
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40 void create_uuid(char *uuid) |
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41 { |
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42 // Read 128 random bytes |
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43 int fd = xopen("/dev/urandom", O_RDONLY); |
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44 xreadall(fd, uuid, 16); |
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45 close(fd); |
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46 |
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47 // Claim to be a DCE format UUID. |
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48 uuid[6] = (uuid[6] & 0x0F) | 0x40; |
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49 uuid[8] = (uuid[8] & 0x3F) | 0x80; |
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50 |
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51 // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should |
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52 // set bit 1 of the node ID, which is the mac multicast bit. This means we |
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53 // should never collide with anybody actually using a macaddr. |
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54 uuid[11] = uuid[11] | 128; |
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55 } |
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56 |
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57 int mke2fs_main(void) |
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58 { |
76 | 59 struct ext2_superblock *sb = xzalloc(sizeof(struct ext2_superblock)); |
60 uint32_t temp; | |
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61 off_t length; |
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62 |
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63 // Handle command line arguments. |
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64 |
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65 if (toys.optargs[1]) { |
76 | 66 sscanf(toys.optargs[1], "%u", &TT.blocks); |
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67 temp = O_RDWR|O_CREAT; |
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68 } else temp = O_RDWR; |
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69 |
76 | 70 // TODO: Check if filesystem is mounted here |
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71 |
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72 // For mke?fs, open file. For gene?fs, create file. |
76 | 73 length = fdlength(TT.fsfd = xcreate(*toys.optargs, temp, 0777)); |
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74 |
76 | 75 // TODO: collect gene2fs list, calculate requirements. |
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76 |
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77 // Fill out superblock structure |
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78 |
76 | 79 // Determine appropriate block size, set log_block_size and log_frag_size. |
80 | |
81 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096; | |
82 if (TT.blocksize == 1024) temp = 0; | |
83 else if (TT.blocksize == 2048) temp = 1; | |
84 else if (TT.blocksize == 4096) temp = 2; | |
85 else error_exit("bad blocksize"); | |
86 sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp); | |
87 | |
88 // Fill out blocks_count, inodes_count, r_blocks_count | |
89 | |
90 if (!TT.blocks) TT.blocks = length/TT.blocksize; | |
91 sb->blocks_count = SWAP_LE32(TT.blocks); | |
92 | |
93 if (!TT.inodes) { | |
94 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192; | |
95 TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode; | |
96 } | |
97 sb->inodes_count = SWAP_LE32(TT.inodes); | |
98 | |
99 if (!TT.reserved_percent) TT.reserved_percent = 5; | |
100 temp = (TT.blocks * (uint64_t)TT.reserved_percent) /100; | |
101 sb->r_blocks_count = SWAP_LE32(temp); | |
102 | |
103 // Set blocks_per_group and frags_per_group, which is the size of an | |
104 // allocation bitmap that fits in one block (I.E. how many bits per block)? | |
105 | |
106 temp = TT.blocksize*8; | |
107 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(temp); | |
108 | |
109 // Set inodes_per_group | |
110 | |
111 TT.groups = (TT.blocks)/temp; | |
112 if (TT.blocks & (temp-1)) TT.groups++; // Round up without int overflow. | |
113 temp = TT.inodes/TT.groups; | |
114 if (TT.blocks & (TT.groups-1)) TT.blocks++; | |
115 sb->inodes_per_group = SWAP_LE32(temp); | |
116 | |
117 sb->max_mnt_count=0xFFFF; | |
118 sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL)); | |
119 sb->magic = SWAP_LE32(0xEF53); | |
120 sb->state = sb->errors = SWAP_LE16(1); | |
121 | |
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122 sb->rev_level = SWAP_LE32(1); |
76 | 123 sb->inode_size = sizeof(struct ext2_inode); |
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124 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE); |
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125 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER); |
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126 |
76 | 127 create_uuid(sb->uuid); |
128 | |
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129 // If we're called as mke3fs or mkfs.ext3, do a journal. |
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130 |
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131 //if (strchr(toys.which->name,'3')) |
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132 // sb->feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; |
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133 |
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134 // We skip the first 1k (to avoid the boot sector, if any). Use this to |
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135 // figure out if this file is seekable. |
76 | 136 if(-1 == lseek(TT.fsfd, 1024, SEEK_SET)) perror_exit("lseek"); |
137 //{ TT.noseek=1; xwrite(TT.fsfd, sb, 1024); } | |
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138 |
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139 // Write superblock to disk. |
76 | 140 xwrite(TT.fsfd, sb, sizeof(struct ext2_superblock)); // 4096-1024 |
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141 |
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142 return 0; |
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143 } |