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