1 | /*
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2 | * swapfs.c --- swap ext2 filesystem data structures
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3 | *
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4 | * Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
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5 | *
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6 | * %Begin-Header%
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7 | * This file may be redistributed under the terms of the GNU Public
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8 | * License.
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9 | * %End-Header%
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10 | */
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11 |
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12 | #include <stdio.h>
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13 | #include <unistd.h>
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14 | #include <string.h>
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15 | #include <time.h>
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16 |
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17 | #include "ext2_fs.h"
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18 | #include "ext2fs.h"
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19 | #include "ext2_ext_attr.h"
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20 |
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21 | #if BB_BIG_ENDIAN
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22 | void ext2fs_swap_super(struct ext2_super_block * sb)
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23 | {
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24 | int i;
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25 | sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
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26 | sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
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27 | sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
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28 | sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
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29 | sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
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30 | sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
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31 | sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
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32 | sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size);
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33 | sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
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34 | sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group);
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35 | sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
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36 | sb->s_mtime = ext2fs_swab32(sb->s_mtime);
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37 | sb->s_wtime = ext2fs_swab32(sb->s_wtime);
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38 | sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
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39 | sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
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40 | sb->s_magic = ext2fs_swab16(sb->s_magic);
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41 | sb->s_state = ext2fs_swab16(sb->s_state);
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42 | sb->s_errors = ext2fs_swab16(sb->s_errors);
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43 | sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
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44 | sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
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45 | sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
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46 | sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
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47 | sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
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48 | sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
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49 | sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
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50 | sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
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51 | sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
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52 | sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
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53 | sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
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54 | sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
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55 | sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
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56 | sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
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57 | sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
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58 | sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
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59 | sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
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60 | sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
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61 | sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
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62 | sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
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63 | sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
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64 | for (i=0; i < 4; i++)
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65 | sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
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66 | for (i=0; i < 17; i++)
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67 | sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
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68 |
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69 | }
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70 |
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71 | void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
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72 | {
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73 | gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
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74 | gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
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75 | gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
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76 | gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
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77 | gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
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78 | gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
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79 | }
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80 |
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81 | void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
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82 | {
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83 | struct ext2_ext_attr_header *from_header =
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84 | (struct ext2_ext_attr_header *)from;
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85 | struct ext2_ext_attr_header *to_header =
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86 | (struct ext2_ext_attr_header *)to;
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87 | struct ext2_ext_attr_entry *from_entry, *to_entry;
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88 | char *from_end = (char *)from_header + bufsize;
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89 | int n;
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90 |
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91 | if (to_header != from_header)
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92 | memcpy(to_header, from_header, bufsize);
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93 |
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94 | from_entry = (struct ext2_ext_attr_entry *)from_header;
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95 | to_entry = (struct ext2_ext_attr_entry *)to_header;
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96 |
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97 | if (has_header) {
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98 | to_header->h_magic = ext2fs_swab32(from_header->h_magic);
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99 | to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
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100 | to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
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101 | for (n=0; n<4; n++)
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102 | to_header->h_reserved[n] =
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103 | ext2fs_swab32(from_header->h_reserved[n]);
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104 | from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
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105 | to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
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106 | }
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107 |
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108 | while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
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109 | to_entry->e_value_offs =
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110 | ext2fs_swab16(from_entry->e_value_offs);
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111 | to_entry->e_value_block =
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112 | ext2fs_swab32(from_entry->e_value_block);
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113 | to_entry->e_value_size =
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114 | ext2fs_swab32(from_entry->e_value_size);
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115 | from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
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116 | to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
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117 | }
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118 | }
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119 |
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120 | void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
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121 | struct ext2_inode_large *f, int hostorder,
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122 | int bufsize)
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123 | {
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124 | unsigned i;
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125 | int islnk = 0;
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126 | __u32 *eaf, *eat;
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127 |
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128 | if (hostorder && LINUX_S_ISLNK(f->i_mode))
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129 | islnk = 1;
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130 | t->i_mode = ext2fs_swab16(f->i_mode);
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131 | if (!hostorder && LINUX_S_ISLNK(t->i_mode))
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132 | islnk = 1;
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133 | t->i_uid = ext2fs_swab16(f->i_uid);
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134 | t->i_size = ext2fs_swab32(f->i_size);
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135 | t->i_atime = ext2fs_swab32(f->i_atime);
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136 | t->i_ctime = ext2fs_swab32(f->i_ctime);
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137 | t->i_mtime = ext2fs_swab32(f->i_mtime);
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138 | t->i_dtime = ext2fs_swab32(f->i_dtime);
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139 | t->i_gid = ext2fs_swab16(f->i_gid);
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140 | t->i_links_count = ext2fs_swab16(f->i_links_count);
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141 | t->i_blocks = ext2fs_swab32(f->i_blocks);
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142 | t->i_flags = ext2fs_swab32(f->i_flags);
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143 | t->i_file_acl = ext2fs_swab32(f->i_file_acl);
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144 | t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
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145 | if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) {
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146 | for (i = 0; i < EXT2_N_BLOCKS; i++)
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147 | t->i_block[i] = ext2fs_swab32(f->i_block[i]);
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148 | } else if (t != f) {
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149 | for (i = 0; i < EXT2_N_BLOCKS; i++)
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150 | t->i_block[i] = f->i_block[i];
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151 | }
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152 | t->i_generation = ext2fs_swab32(f->i_generation);
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153 | t->i_faddr = ext2fs_swab32(f->i_faddr);
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154 |
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155 | switch (fs->super->s_creator_os) {
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156 | case EXT2_OS_LINUX:
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157 | t->osd1.linux1.l_i_reserved1 =
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158 | ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
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159 | t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
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160 | t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
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161 | t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
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162 | t->osd2.linux2.l_i_uid_high =
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163 | ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
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164 | t->osd2.linux2.l_i_gid_high =
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165 | ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
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166 | t->osd2.linux2.l_i_reserved2 =
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167 | ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
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168 | break;
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169 | case EXT2_OS_HURD:
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170 | t->osd1.hurd1.h_i_translator =
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171 | ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
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172 | t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
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173 | t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
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174 | t->osd2.hurd2.h_i_mode_high =
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175 | ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
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176 | t->osd2.hurd2.h_i_uid_high =
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177 | ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
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178 | t->osd2.hurd2.h_i_gid_high =
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179 | ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
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180 | t->osd2.hurd2.h_i_author =
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181 | ext2fs_swab32 (f->osd2.hurd2.h_i_author);
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182 | break;
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183 | case EXT2_OS_MASIX:
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184 | t->osd1.masix1.m_i_reserved1 =
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185 | ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
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186 | t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
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187 | t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
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188 | t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
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189 | t->osd2.masix2.m_i_reserved2[0] =
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190 | ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
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191 | t->osd2.masix2.m_i_reserved2[1] =
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192 | ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
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193 | break;
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194 | }
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195 |
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196 | if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
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197 | return; /* no i_extra_isize field */
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198 |
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199 | t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
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200 | if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) -
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201 | sizeof(struct ext2_inode)) {
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202 | /* this is error case: i_extra_size is too large */
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203 | return;
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204 | }
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205 |
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206 | i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32);
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207 | if (bufsize < (int) i)
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208 | return; /* no space for EA magic */
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209 |
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210 | eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
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211 | f->i_extra_isize);
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212 |
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213 | if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
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214 | return; /* it seems no magic here */
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215 |
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216 | eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
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217 | f->i_extra_isize);
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218 | *eat = ext2fs_swab32(*eaf);
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219 |
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220 | /* convert EA(s) */
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221 | ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
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222 | bufsize - sizeof(struct ext2_inode) -
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223 | t->i_extra_isize - sizeof(__u32), 0);
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224 |
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225 | }
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226 |
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227 | void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
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228 | struct ext2_inode *f, int hostorder)
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229 | {
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230 | ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
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231 | (struct ext2_inode_large *) f, hostorder,
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232 | sizeof(struct ext2_inode));
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233 | }
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234 |
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235 | #endif
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