1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * mkfs_reiser: utility to create ReiserFS filesystem
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4 | *
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5 | * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 | #include "libbb.h"
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10 | #include <linux/fs.h>
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11 |
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12 | char BUG_wrong_field_size(void);
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13 | #define STORE_LE(field, value) \
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14 | do { \
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15 | if (sizeof(field) == 4) \
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16 | field = SWAP_LE32(value); \
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17 | else if (sizeof(field) == 2) \
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18 | field = SWAP_LE16(value); \
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19 | else if (sizeof(field) == 1) \
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20 | field = (value); \
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21 | else \
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22 | BUG_wrong_field_size(); \
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23 | } while (0)
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24 |
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25 | #define FETCH_LE32(field) \
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26 | (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
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27 |
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28 | struct journal_params {
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29 | uint32_t jp_journal_1st_block; /* where does journal start from on its device */
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30 | uint32_t jp_journal_dev; /* journal device st_rdev */
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31 | uint32_t jp_journal_size; /* size of the journal on FS creation. used to make sure they don't overflow it */
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32 | uint32_t jp_journal_trans_max; /* max number of blocks in a transaction. */
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33 | uint32_t jp_journal_magic; /* random value made on fs creation (this was sb_journal_block_count) */
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34 | uint32_t jp_journal_max_batch; /* max number of blocks to batch into a trans */
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35 | uint32_t jp_journal_max_commit_age; /* in seconds, how old can an async commit be */
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36 | uint32_t jp_journal_max_trans_age; /* in seconds, how old can a transaction be */
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37 | };
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38 |
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39 | struct reiserfs_journal_header {
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40 | uint32_t jh_last_flush_trans_id; /* id of last fully flushed transaction */
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41 | uint32_t jh_first_unflushed_offset; /* offset in the log of where to start replay after a crash */
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42 | uint32_t jh_mount_id;
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43 | struct journal_params jh_journal;
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44 | uint32_t jh_last_check_mount_id; /* the mount id of the fs during the last reiserfsck --check. */
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45 | };
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46 |
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47 | struct reiserfs_super_block {
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48 | uint32_t sb_block_count; /* 0 number of block on data device */
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49 | uint32_t sb_free_blocks; /* 4 free blocks count */
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50 | uint32_t sb_root_block; /* 8 root of the tree */
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51 |
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52 | struct journal_params sb_journal; /* 12 */
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53 |
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54 | uint16_t sb_blocksize; /* 44 */
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55 | uint16_t sb_oid_maxsize; /* 46 max size of object id array, see get_objectid() commentary */
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56 | uint16_t sb_oid_cursize; /* 48 current size of object id array */
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57 | uint16_t sb_umount_state; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */
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58 |
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59 | char s_magic[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
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60 | uint16_t sb_fs_state; /* 62 it is set to used by fsck to mark which phase of rebuilding is done (used for fsck debugging) */
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61 | uint32_t sb_hash_function_code; /* 64 code of fuction which was/is/will be used to sort names in a directory. See codes in above */
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62 | uint16_t sb_tree_height; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */
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63 | uint16_t sb_bmap_nr; /* 70 amount of bitmap blocks needed to address each block of file system */
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64 | uint16_t sb_version; /* 72 this field is only reliable on filesystem with non-standard journal */
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65 | uint16_t sb_reserved_for_journal; /* 74 size in blocks of journal area on main device, we need to keep after non-standard journal relocation */
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66 | uint32_t sb_inode_generation; /* 76 */
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67 | uint32_t sb_flags; /* 80 Right now used only by inode-attributes, if enabled */
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68 | unsigned char s_uuid[16]; /* 84 filesystem unique identifier */
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69 | unsigned char s_label[16]; /* 100 filesystem volume label */
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70 | uint16_t sb_mnt_count; /* 116 */
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71 | uint16_t sb_max_mnt_count; /* 118 */
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72 | uint32_t sb_lastcheck; /* 120 */
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73 | uint32_t sb_check_interval; /* 124 */
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74 | /* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */
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75 | char s_unused[76]; /* 128 */
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76 | /* 204 */
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77 | };
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78 |
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79 | /* Header of a disk block. More precisely, header of a formatted leaf
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80 | or internal node, and not the header of an unformatted node. */
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81 | struct block_head {
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82 | uint16_t blk2_level; /* Level of a block in the tree. */
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83 | uint16_t blk2_nr_item; /* Number of keys/items in a block. */
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84 | uint16_t blk2_free_space; /* Block free space in bytes. */
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85 | uint16_t blk_reserved;
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86 | uint32_t reserved[4];
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87 | };
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88 |
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89 | #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
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90 |
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91 | #define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs"
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92 | #define REISERFS_FORMAT_3_6 2
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93 | #define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */
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94 | #define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */
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95 |
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96 | #define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */
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97 |
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98 | #define JOURNAL_MIN_SIZE 512
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99 | /* biggest possible single transaction, don't change for now (8/3/99) */
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100 | #define JOURNAL_TRANS_MAX 1024
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101 | #define JOURNAL_TRANS_MIN 256 /* need to check whether it works */
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102 | #define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */
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103 | #define JOURNAL_MIN_RATIO 2
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104 | /* max blocks to batch into one transaction, don't make this any bigger than 900 */
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105 | #define JOURNAL_MAX_BATCH 900
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106 | #define JOURNAL_MAX_COMMIT_AGE 30
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107 |
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108 |
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109 | // Standard mkreiserfs 3.6.21:
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110 | // -b | --block-size N size of file-system block, in bytes
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111 | // -j | --journal-device FILE path to separate device to hold journal
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112 | // -s | --journal-size N size of the journal in blocks
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113 | // -o | --journal-offset N offset of the journal from the start of
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114 | // the separate device, in blocks
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115 | // -t | --transaction-max-size N maximal size of transaction, in blocks
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116 | // -B | --badblocks file store all bad blocks given in file on the fs
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117 | // -h | --hash rupasov|tea|r5 hash function to use by default
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118 | // -u | --uuid UUID store UUID in the superblock
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119 | // -l | --label LABEL store LABEL in the superblock
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120 | // --format 3.5|3.6 old 3.5 format or newer 3.6
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121 | // -f | --force specified once, make mkreiserfs the whole
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122 | // disk, not block device or mounted partition;
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123 | // specified twice, do not ask for confirmation
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124 | // -q | --quiet quiet work without messages, progress and
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125 | // questions. Useful if run in a script. For use
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126 | // by end users only.
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127 | // -d | --debug print debugging information during mkreiser
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128 | // -V print version and exit
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129 |
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130 | // Options not commented below are taken but silently ignored:
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131 | enum {
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132 | OPT_b = 1 << 0,
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133 | OPT_j = 1 << 1,
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134 | OPT_s = 1 << 2,
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135 | OPT_o = 1 << 3,
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136 | OPT_t = 1 << 4,
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137 | OPT_B = 1 << 5,
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138 | OPT_h = 1 << 6,
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139 | OPT_u = 1 << 7,
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140 | OPT_l = 1 << 8, // label
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141 | OPT_f = 1 << 9, // ask no questions
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142 | OPT_q = 1 << 10,
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143 | OPT_d = 1 << 11,
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144 | //OPT_V = 1 << 12, // -V version. bbox applets don't support that
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145 | };
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146 |
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147 | int mkfs_reiser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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148 | int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv)
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149 | {
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150 | unsigned blocksize = 4096;
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151 | unsigned journal_blocks = 8192;
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152 | unsigned blocks, bitmap_blocks, i, block;
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153 | time_t timestamp;
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154 | const char *label = "";
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155 | struct stat st;
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156 | int fd;
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157 | uint8_t *buf;
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158 | struct reiserfs_super_block *sb;
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159 | struct journal_params *jp;
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160 | struct block_head *root;
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161 |
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162 | // using global "option_mask32" instead of local "opts":
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163 | // we are register starved here
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164 | opt_complementary = "-1:b+";
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165 | /*opts =*/ getopt32(argv, "b:j:s:o:t:B:h:u:l:fqd",
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166 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &label);
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167 | argv += optind; // argv[0] -- device
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168 |
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169 | // check the device is a block device
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170 | fd = xopen(argv[0], O_WRONLY | O_EXCL);
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171 | xfstat(fd, &st, argv[0]);
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172 | if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_f))
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173 | bb_error_msg_and_die("%s: not a block device", argv[0]);
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174 |
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175 | // check if it is mounted
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176 | // N.B. what if we format a file? find_mount_point will return false negative since
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177 | // it is loop block device which is mounted!
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178 | if (find_mount_point(argv[0], 0))
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179 | bb_error_msg_and_die("can't format mounted filesystem");
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180 |
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181 | // open the device, get size in blocks
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182 | blocks = get_volume_size_in_bytes(fd, argv[1], blocksize, /*extend:*/ 1) / blocksize;
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183 |
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184 | // block number sanity check
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185 | // we have a limit: skipped area, super block, journal and root block
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186 | // all have to be addressed by one first bitmap
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187 | block = REISERFS_DISK_OFFSET_IN_BYTES / blocksize // boot area
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188 | + 1 // sb
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189 | + 1 // bitmap#0
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190 | + journal_blocks+1 // journal
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191 | ;
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192 |
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193 | // count overhead
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194 | bitmap_blocks = (blocks - 1) / (blocksize * 8) + 1;
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195 | i = block + bitmap_blocks;
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196 |
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197 | // check overhead
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198 | if (MIN(blocksize * 8, blocks) < i)
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199 | bb_error_msg_and_die("need >= %u blocks", i);
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200 |
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201 | // ask confirmation?
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202 | // TODO: ???
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203 |
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204 | // wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device
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205 | // TODO: do we really need to wipe?!
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206 | xlseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET);
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207 |
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208 | // fill superblock
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209 | sb = (struct reiserfs_super_block *)xzalloc(blocksize);
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210 | // block count
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211 | STORE_LE(sb->sb_block_count, blocks);
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212 | STORE_LE(sb->sb_free_blocks, blocks - i);
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213 | // TODO: decypher!
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214 | STORE_LE(sb->sb_root_block, block);
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215 | // fill journal related fields
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216 | jp = &sb->sb_journal;
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217 | STORE_LE(jp->jp_journal_1st_block, REISERFS_DISK_OFFSET_IN_BYTES / blocksize + 1/*sb*/ + 1/*bmp#0*/);
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218 | timestamp = time(NULL);
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219 | srandom(timestamp);
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220 | STORE_LE(jp->jp_journal_magic, random());
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221 | STORE_LE(jp->jp_journal_size, journal_blocks);
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222 | STORE_LE(jp->jp_journal_trans_max, JOURNAL_TRANS_MAX);
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223 | STORE_LE(jp->jp_journal_max_batch, JOURNAL_MAX_BATCH);
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224 | STORE_LE(jp->jp_journal_max_commit_age, JOURNAL_MAX_COMMIT_AGE);
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225 | // sizes
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226 | STORE_LE(sb->sb_blocksize, blocksize);
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227 | STORE_LE(sb->sb_oid_maxsize, (blocksize - sizeof(*sb)) / sizeof(uint32_t) / 2 * 2);
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228 | STORE_LE(sb->sb_oid_cursize, 2); // "." and ".."
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229 | strcpy(sb->s_magic, REISERFS_3_6_SUPER_MAGIC_STRING);
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230 | STORE_LE(sb->sb_bmap_nr, (bitmap_blocks > ((1LL << 16) - 1)) ? 0 : bitmap_blocks);
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231 | // misc
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232 | STORE_LE(sb->sb_version, REISERFS_FORMAT_3_6);
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233 | STORE_LE(sb->sb_lastcheck, timestamp);
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234 | STORE_LE(sb->sb_check_interval, DEFAULT_CHECK_INTERVAL);
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235 | STORE_LE(sb->sb_mnt_count, 1);
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236 | STORE_LE(sb->sb_max_mnt_count, DEFAULT_MAX_MNT_COUNT);
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237 | STORE_LE(sb->sb_umount_state, FS_CLEANLY_UMOUNTED);
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238 | STORE_LE(sb->sb_tree_height, 2);
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239 | STORE_LE(sb->sb_hash_function_code, 3); // R5_HASH
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240 | STORE_LE(sb->sb_flags, 1);
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241 | //STORE_LE(sb->sb_reserved_for_journal, 0);
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242 | // create UUID
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243 | generate_uuid(sb->s_uuid);
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244 | // write the label
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245 | safe_strncpy((char *)sb->s_label, label, sizeof(sb->s_label));
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246 |
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247 | // TODO: EMPIRIC! ENDIANNESS!
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248 | // superblock has only 204 bytes. What are these?
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249 | buf = (uint8_t *)sb;
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250 | buf[205] = 1;
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251 | buf[209] = 3;
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252 |
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253 | // put superblock
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254 | xwrite(fd, sb, blocksize);
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255 |
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256 | // create bitmaps
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257 | buf = xzalloc(blocksize);
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258 |
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259 | // bitmap #0 uses initial "block"+1 blocks
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260 | i = block + 1;
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261 | memset(buf, 0xFF, i / 8);
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262 | buf[i / 8] = (1 << (i & 7)) - 1; //0..7 => 00000000..01111111
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263 | // mark trailing absent blocks, if any
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264 | if (blocks < 8*blocksize) {
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265 | unsigned n = 8*blocksize - blocks;
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266 | i = n / 8;
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267 | buf[blocksize - i - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
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268 | memset(buf + blocksize - i, 0xFF, i); // N.B. no overflow here!
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269 | }
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270 | // put bitmap #0
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271 | xwrite(fd, buf, blocksize);
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272 |
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273 | // now go journal blocks
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274 | memset(buf, 0, blocksize);
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275 | for (i = 0; i < journal_blocks; i++)
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276 | xwrite(fd, buf, blocksize);
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277 | // dump journal control block
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278 | memcpy(&((struct reiserfs_journal_header *)buf)->jh_journal, &sb->sb_journal, sizeof(sb->sb_journal));
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279 | xwrite(fd, buf, blocksize);
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280 |
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281 | // other bitmaps are in every (8*blocksize)-th block
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282 | // N.B. they use the only block -- namely bitmap itself!
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283 | buf[0] = 0x01;
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284 | // put bitmaps
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285 | for (i = 1; i < bitmap_blocks; i++) {
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286 | xlseek(fd, i*8*blocksize * blocksize, SEEK_SET);
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287 | // mark trailing absent blocks, if any
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288 | if (i == bitmap_blocks - 1 && (blocks % (8*blocksize))) {
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289 | unsigned n = 8*blocksize - blocks % (8*blocksize);
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290 | unsigned j = n / 8;
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291 | buf[blocksize - j - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
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292 | memset(buf + blocksize - j, 0xFF, j); // N.B. no overflow here!
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293 | }
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294 | xwrite(fd, buf, blocksize);
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295 | }
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296 |
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297 | // fill root block
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298 | // block head
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299 | memset(buf, 0, blocksize);
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300 | root = (struct block_head *)buf;
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301 | STORE_LE(root->blk2_level, 1); // leaf node
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302 | STORE_LE(root->blk2_nr_item, 2); // "." and ".."
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303 | STORE_LE(root->blk2_free_space, blocksize - sizeof(struct block_head));
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304 | // item head
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305 | // root directory
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306 | // TODO: EMPIRIC! ENDIANNESS!
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307 | // TODO: indented assignments seem to be timestamps
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308 | buf[4] = 0134;
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309 | buf[24] = 01;
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310 | buf[28] = 02;
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311 | buf[42] = 054;
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312 | buf[44] = 0324;
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313 | buf[45] = 017;
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314 | buf[46] = 01;
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315 | buf[48] = 01;
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316 | buf[52] = 02;
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317 | buf[56] = 01;
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318 | buf[60] = 0364;
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319 | buf[61] = 01;
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320 | buf[64] = 02;
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321 | buf[66] = 060;
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322 | buf[68] = 0244;
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323 | buf[69] = 017;
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324 | buf[4004] = 01;
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325 | buf[4008] = 01;
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326 | buf[4012] = 02;
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327 | buf[4016] = 050;
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328 | buf[4018] = 04;
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329 | buf[4020] = 02;
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330 | buf[4028] = 01;
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331 | buf[4032] = 040;
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332 | buf[4034] = 04;
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333 |
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334 | buf[4036] = 056; buf[4037] = 056; // ".."
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335 | buf[4044] = 056; // "."
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336 |
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337 | buf[4052] = 0355;
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338 | buf[4053] = 0101;
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339 | buf[4056] = 03;
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340 | buf[4060] = 060;
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341 | buf[4076] = 0173;
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342 | buf[4077] = 0240;
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343 | buf[4078] = 0344;
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344 | buf[4079] = 0112;
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345 | buf[4080] = 0173;
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346 | buf[4081] = 0240;
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347 | buf[4082] = 0344;
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348 | buf[4083] = 0112;
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349 | buf[4084] = 0173;
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350 | buf[4085] = 0240;
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351 | buf[4086] = 0344;
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352 | buf[4087] = 0112;
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353 | buf[4088] = 01;
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354 |
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355 | // put root block
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356 | xlseek(fd, block * blocksize, SEEK_SET);
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357 | xwrite(fd, buf, blocksize);
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358 |
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359 | // cleanup
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360 | if (ENABLE_FEATURE_CLEAN_UP) {
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361 | free(buf);
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362 | free(sb);
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363 | }
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364 |
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365 | xclose(fd);
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366 | return EXIT_SUCCESS;
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367 | }
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