1/* vi: set sw=4 ts=4: */ 2/* 3 * swapfs.c --- swap ext2 filesystem data structures 4 * 5 * Copyright (C) 1995, 1996, 2002 Theodore Ts'o. 6 * 7 * %Begin-Header% 8 * This file may be redistributed under the terms of the GNU Public 9 * License. 10 * %End-Header% 11 */ 12 13#include <stdio.h> 14#include <unistd.h> 15#include <string.h> 16#include <time.h> 17 18#include "ext2_fs.h" 19#include "ext2fs.h" 20#include "ext2_ext_attr.h" 21 22#if BB_BIG_ENDIAN 23void ext2fs_swap_super(struct ext2_super_block * sb) 24{ 25 int i; 26 sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); 27 sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); 28 sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); 29 sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); 30 sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); 31 sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); 32 sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); 33 sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size); 34 sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); 35 sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group); 36 sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); 37 sb->s_mtime = ext2fs_swab32(sb->s_mtime); 38 sb->s_wtime = ext2fs_swab32(sb->s_wtime); 39 sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); 40 sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); 41 sb->s_magic = ext2fs_swab16(sb->s_magic); 42 sb->s_state = ext2fs_swab16(sb->s_state); 43 sb->s_errors = ext2fs_swab16(sb->s_errors); 44 sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); 45 sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); 46 sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); 47 sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); 48 sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); 49 sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); 50 sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); 51 sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); 52 sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); 53 sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); 54 sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); 55 sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); 56 sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); 57 sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); 58 sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); 59 sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); 60 sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); 61 sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); 62 sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); 63 sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); 64 sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); 65 for (i=0; i < 4; i++) 66 sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); 67 for (i=0; i < 17; i++) 68 sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); 69 70} 71 72void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) 73{ 74 gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); 75 gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); 76 gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); 77 gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); 78 gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); 79 gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); 80} 81 82void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header) 83{ 84 struct ext2_ext_attr_header *from_header = 85 (struct ext2_ext_attr_header *)from; 86 struct ext2_ext_attr_header *to_header = 87 (struct ext2_ext_attr_header *)to; 88 struct ext2_ext_attr_entry *from_entry, *to_entry; 89 char *from_end = (char *)from_header + bufsize; 90 int n; 91 92 if (to_header != from_header) 93 memcpy(to_header, from_header, bufsize); 94 95 from_entry = (struct ext2_ext_attr_entry *)from_header; 96 to_entry = (struct ext2_ext_attr_entry *)to_header; 97 98 if (has_header) { 99 to_header->h_magic = ext2fs_swab32(from_header->h_magic); 100 to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); 101 to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); 102 for (n=0; n<4; n++) 103 to_header->h_reserved[n] = 104 ext2fs_swab32(from_header->h_reserved[n]); 105 from_entry = (struct ext2_ext_attr_entry *)(from_header+1); 106 to_entry = (struct ext2_ext_attr_entry *)(to_header+1); 107 } 108 109 while ((char *)from_entry < from_end && *(__u32 *)from_entry) { 110 to_entry->e_value_offs = 111 ext2fs_swab16(from_entry->e_value_offs); 112 to_entry->e_value_block = 113 ext2fs_swab32(from_entry->e_value_block); 114 to_entry->e_value_size = 115 ext2fs_swab32(from_entry->e_value_size); 116 from_entry = EXT2_EXT_ATTR_NEXT(from_entry); 117 to_entry = EXT2_EXT_ATTR_NEXT(to_entry); 118 } 119} 120 121void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, 122 struct ext2_inode_large *f, int hostorder, 123 int bufsize) 124{ 125 unsigned i; 126 int islnk = 0; 127 __u32 *eaf, *eat; 128 129 if (hostorder && LINUX_S_ISLNK(f->i_mode)) 130 islnk = 1; 131 t->i_mode = ext2fs_swab16(f->i_mode); 132 if (!hostorder && LINUX_S_ISLNK(t->i_mode)) 133 islnk = 1; 134 t->i_uid = ext2fs_swab16(f->i_uid); 135 t->i_size = ext2fs_swab32(f->i_size); 136 t->i_atime = ext2fs_swab32(f->i_atime); 137 t->i_ctime = ext2fs_swab32(f->i_ctime); 138 t->i_mtime = ext2fs_swab32(f->i_mtime); 139 t->i_dtime = ext2fs_swab32(f->i_dtime); 140 t->i_gid = ext2fs_swab16(f->i_gid); 141 t->i_links_count = ext2fs_swab16(f->i_links_count); 142 t->i_blocks = ext2fs_swab32(f->i_blocks); 143 t->i_flags = ext2fs_swab32(f->i_flags); 144 t->i_file_acl = ext2fs_swab32(f->i_file_acl); 145 t->i_dir_acl = ext2fs_swab32(f->i_dir_acl); 146 if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) { 147 for (i = 0; i < EXT2_N_BLOCKS; i++) 148 t->i_block[i] = ext2fs_swab32(f->i_block[i]); 149 } else if (t != f) { 150 for (i = 0; i < EXT2_N_BLOCKS; i++) 151 t->i_block[i] = f->i_block[i]; 152 } 153 t->i_generation = ext2fs_swab32(f->i_generation); 154 t->i_faddr = ext2fs_swab32(f->i_faddr); 155 156 switch (fs->super->s_creator_os) { 157 case EXT2_OS_LINUX: 158 t->osd1.linux1.l_i_reserved1 = 159 ext2fs_swab32(f->osd1.linux1.l_i_reserved1); 160 t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag; 161 t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize; 162 t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1); 163 t->osd2.linux2.l_i_uid_high = 164 ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); 165 t->osd2.linux2.l_i_gid_high = 166 ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); 167 t->osd2.linux2.l_i_reserved2 = 168 ext2fs_swab32(f->osd2.linux2.l_i_reserved2); 169 break; 170 case EXT2_OS_HURD: 171 t->osd1.hurd1.h_i_translator = 172 ext2fs_swab32 (f->osd1.hurd1.h_i_translator); 173 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; 174 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; 175 t->osd2.hurd2.h_i_mode_high = 176 ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); 177 t->osd2.hurd2.h_i_uid_high = 178 ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); 179 t->osd2.hurd2.h_i_gid_high = 180 ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); 181 t->osd2.hurd2.h_i_author = 182 ext2fs_swab32 (f->osd2.hurd2.h_i_author); 183 break; 184 case EXT2_OS_MASIX: 185 t->osd1.masix1.m_i_reserved1 = 186 ext2fs_swab32(f->osd1.masix1.m_i_reserved1); 187 t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag; 188 t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize; 189 t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1); 190 t->osd2.masix2.m_i_reserved2[0] = 191 ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]); 192 t->osd2.masix2.m_i_reserved2[1] = 193 ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]); 194 break; 195 } 196 197 if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) 198 return; /* no i_extra_isize field */ 199 200 t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); 201 if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) - 202 sizeof(struct ext2_inode)) { 203 /* this is error case: i_extra_size is too large */ 204 return; 205 } 206 207 i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32); 208 if (bufsize < (int) i) 209 return; /* no space for EA magic */ 210 211 eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + 212 f->i_extra_isize); 213 214 if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC) 215 return; /* it seems no magic here */ 216 217 eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + 218 f->i_extra_isize); 219 *eat = ext2fs_swab32(*eaf); 220 221 /* convert EA(s) */ 222 ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), 223 bufsize - sizeof(struct ext2_inode) - 224 t->i_extra_isize - sizeof(__u32), 0); 225 226} 227 228void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t, 229 struct ext2_inode *f, int hostorder) 230{ 231 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t, 232 (struct ext2_inode_large *) f, hostorder, 233 sizeof(struct ext2_inode)); 234} 235 236#endif 237