| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * swapfs.c --- swap ext2 filesystem data structures
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| 4 | *
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| 5 | * Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
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| 6 | *
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| 7 | * %Begin-Header%
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| 8 | * This file may be redistributed under the terms of the GNU Public
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| 9 | * License.
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| 10 | * %End-Header%
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| 11 | */
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| 12 |
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| 13 | #include <stdio.h>
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| 14 | #include <unistd.h>
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| 15 | #include <string.h>
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| 16 | #include <time.h>
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| 17 |
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| 18 | #include "ext2_fs.h"
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| 19 | #include "ext2fs.h"
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| 20 | #include "ext2_ext_attr.h"
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| 21 |
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| 22 | #if BB_BIG_ENDIAN
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| 23 | void ext2fs_swap_super(struct ext2_super_block * sb)
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| 24 | {
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| 25 | int i;
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| 26 | sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
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| 27 | sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
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| 28 | sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
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| 29 | sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
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| 30 | sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
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| 31 | sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
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| 32 | sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
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| 33 | sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size);
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| 34 | sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
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| 35 | sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group);
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| 36 | sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
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| 37 | sb->s_mtime = ext2fs_swab32(sb->s_mtime);
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| 38 | sb->s_wtime = ext2fs_swab32(sb->s_wtime);
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| 39 | sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
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| 40 | sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
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| 41 | sb->s_magic = ext2fs_swab16(sb->s_magic);
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| 42 | sb->s_state = ext2fs_swab16(sb->s_state);
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| 43 | sb->s_errors = ext2fs_swab16(sb->s_errors);
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| 44 | sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
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| 45 | sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
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| 46 | sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
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| 47 | sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
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| 48 | sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
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| 49 | sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
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| 50 | sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
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| 51 | sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
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| 52 | sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
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| 53 | sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
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| 54 | sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
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| 55 | sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
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| 56 | sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
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| 57 | sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
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| 58 | sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
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| 59 | sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
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| 60 | sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
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| 61 | sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
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| 62 | sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
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| 63 | sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
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| 64 | sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
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| 65 | for (i=0; i < 4; i++)
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| 66 | sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
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| 67 | for (i=0; i < 17; i++)
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| 68 | sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
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| 69 |
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| 70 | }
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| 71 |
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| 72 | void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
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| 73 | {
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| 74 | gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
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| 75 | gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
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| 76 | gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
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| 77 | gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
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| 78 | gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
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| 79 | gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
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| 80 | }
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| 81 |
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| 82 | void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
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| 83 | {
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| 84 | struct ext2_ext_attr_header *from_header =
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| 85 | (struct ext2_ext_attr_header *)from;
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| 86 | struct ext2_ext_attr_header *to_header =
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| 87 | (struct ext2_ext_attr_header *)to;
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| 88 | struct ext2_ext_attr_entry *from_entry, *to_entry;
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| 89 | char *from_end = (char *)from_header + bufsize;
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| 90 | int n;
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| 91 |
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| 92 | if (to_header != from_header)
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| 93 | memcpy(to_header, from_header, bufsize);
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| 94 |
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| 95 | from_entry = (struct ext2_ext_attr_entry *)from_header;
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| 96 | to_entry = (struct ext2_ext_attr_entry *)to_header;
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| 97 |
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| 98 | if (has_header) {
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| 99 | to_header->h_magic = ext2fs_swab32(from_header->h_magic);
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| 100 | to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
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| 101 | to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
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| 102 | for (n=0; n<4; n++)
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| 103 | to_header->h_reserved[n] =
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| 104 | ext2fs_swab32(from_header->h_reserved[n]);
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| 105 | from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
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| 106 | to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
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| 107 | }
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| 108 |
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| 109 | while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
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| 110 | to_entry->e_value_offs =
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| 111 | ext2fs_swab16(from_entry->e_value_offs);
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| 112 | to_entry->e_value_block =
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| 113 | ext2fs_swab32(from_entry->e_value_block);
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| 114 | to_entry->e_value_size =
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| 115 | ext2fs_swab32(from_entry->e_value_size);
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| 116 | from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
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| 117 | to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
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| 118 | }
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| 119 | }
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| 120 |
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| 121 | void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
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| 122 | struct ext2_inode_large *f, int hostorder,
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| 123 | int bufsize)
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| 124 | {
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| 125 | unsigned i;
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| 126 | int islnk = 0;
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| 127 | __u32 *eaf, *eat;
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| 128 |
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| 129 | if (hostorder && LINUX_S_ISLNK(f->i_mode))
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| 130 | islnk = 1;
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| 131 | t->i_mode = ext2fs_swab16(f->i_mode);
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| 132 | if (!hostorder && LINUX_S_ISLNK(t->i_mode))
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| 133 | islnk = 1;
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| 134 | t->i_uid = ext2fs_swab16(f->i_uid);
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| 135 | t->i_size = ext2fs_swab32(f->i_size);
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| 136 | t->i_atime = ext2fs_swab32(f->i_atime);
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| 137 | t->i_ctime = ext2fs_swab32(f->i_ctime);
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| 138 | t->i_mtime = ext2fs_swab32(f->i_mtime);
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| 139 | t->i_dtime = ext2fs_swab32(f->i_dtime);
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| 140 | t->i_gid = ext2fs_swab16(f->i_gid);
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| 141 | t->i_links_count = ext2fs_swab16(f->i_links_count);
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| 142 | t->i_blocks = ext2fs_swab32(f->i_blocks);
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| 143 | t->i_flags = ext2fs_swab32(f->i_flags);
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| 144 | t->i_file_acl = ext2fs_swab32(f->i_file_acl);
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| 145 | t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
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| 146 | if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) {
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| 147 | for (i = 0; i < EXT2_N_BLOCKS; i++)
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| 148 | t->i_block[i] = ext2fs_swab32(f->i_block[i]);
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| 149 | } else if (t != f) {
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| 150 | for (i = 0; i < EXT2_N_BLOCKS; i++)
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| 151 | t->i_block[i] = f->i_block[i];
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| 152 | }
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| 153 | t->i_generation = ext2fs_swab32(f->i_generation);
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| 154 | t->i_faddr = ext2fs_swab32(f->i_faddr);
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| 155 |
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| 156 | switch (fs->super->s_creator_os) {
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| 157 | case EXT2_OS_LINUX:
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| 158 | t->osd1.linux1.l_i_reserved1 =
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| 159 | ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
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| 160 | t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
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| 161 | t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
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| 162 | t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
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| 163 | t->osd2.linux2.l_i_uid_high =
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| 164 | ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
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| 165 | t->osd2.linux2.l_i_gid_high =
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| 166 | ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
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| 167 | t->osd2.linux2.l_i_reserved2 =
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| 168 | ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
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| 169 | break;
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| 170 | case EXT2_OS_HURD:
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| 171 | t->osd1.hurd1.h_i_translator =
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| 172 | ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
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| 173 | t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
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| 174 | t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
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| 175 | t->osd2.hurd2.h_i_mode_high =
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| 176 | ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
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| 177 | t->osd2.hurd2.h_i_uid_high =
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| 178 | ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
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| 179 | t->osd2.hurd2.h_i_gid_high =
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| 180 | ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
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| 181 | t->osd2.hurd2.h_i_author =
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| 182 | ext2fs_swab32 (f->osd2.hurd2.h_i_author);
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| 183 | break;
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| 184 | case EXT2_OS_MASIX:
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| 185 | t->osd1.masix1.m_i_reserved1 =
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| 186 | ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
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| 187 | t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
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| 188 | t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
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| 189 | t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
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| 190 | t->osd2.masix2.m_i_reserved2[0] =
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| 191 | ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
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| 192 | t->osd2.masix2.m_i_reserved2[1] =
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| 193 | ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
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| 194 | break;
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| 195 | }
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| 196 |
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| 197 | if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
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| 198 | return; /* no i_extra_isize field */
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| 199 |
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| 200 | t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
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| 201 | if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) -
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| 202 | sizeof(struct ext2_inode)) {
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| 203 | /* this is error case: i_extra_size is too large */
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| 204 | return;
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| 205 | }
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| 206 |
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| 207 | i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32);
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| 208 | if (bufsize < (int) i)
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| 209 | return; /* no space for EA magic */
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| 210 |
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| 211 | eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
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| 212 | f->i_extra_isize);
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| 213 |
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| 214 | if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
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| 215 | return; /* it seems no magic here */
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| 216 |
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| 217 | eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
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| 218 | f->i_extra_isize);
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| 219 | *eat = ext2fs_swab32(*eaf);
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| 220 |
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| 221 | /* convert EA(s) */
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| 222 | ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
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| 223 | bufsize - sizeof(struct ext2_inode) -
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| 224 | t->i_extra_isize - sizeof(__u32), 0);
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| 225 |
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| 226 | }
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| 227 |
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| 228 | void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
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| 229 | struct ext2_inode *f, int hostorder)
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| 230 | {
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| 231 | ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
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| 232 | (struct ext2_inode_large *) f, hostorder,
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| 233 | sizeof(struct ext2_inode));
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| 234 | }
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| 235 |
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| 236 | #endif
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