swapfs.c revision 8815fb8a00f5a441eb62f035353db9e0cca90b38
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#if HAVE_UNISTD_H 14#include <unistd.h> 15#endif 16#include <string.h> 17#include <time.h> 18 19#include "ext2_fs.h" 20#include "ext2fs.h" 21#include <ext2fs/ext2_ext_attr.h> 22 23#ifdef EXT2FS_ENABLE_SWAPFS 24void ext2fs_swap_super(struct ext2_super_block * sb) 25{ 26 int i; 27 sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); 28 sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); 29 sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); 30 sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); 31 sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); 32 sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); 33 sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); 34 sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size); 35 sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); 36 sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group); 37 sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); 38 sb->s_mtime = ext2fs_swab32(sb->s_mtime); 39 sb->s_wtime = ext2fs_swab32(sb->s_wtime); 40 sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); 41 sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); 42 sb->s_magic = ext2fs_swab16(sb->s_magic); 43 sb->s_state = ext2fs_swab16(sb->s_state); 44 sb->s_errors = ext2fs_swab16(sb->s_errors); 45 sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); 46 sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); 47 sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); 48 sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); 49 sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); 50 sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); 51 sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); 52 sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); 53 sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); 54 sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); 55 sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); 56 sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); 57 sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); 58 sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); 59 sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); 60 sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); 61 sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); 62 sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); 63 sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); 64 sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); 65 sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); 66 for (i=0; i < 4; i++) 67 sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); 68 for (i=0; i < 17; i++) 69 sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); 70 71} 72 73void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) 74{ 75 gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); 76 gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); 77 gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); 78 gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); 79 gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); 80 gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); 81 gdp->bg_flags = ext2fs_swab16(gdp->bg_flags); 82 gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused); 83 gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum); 84} 85 86void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header) 87{ 88 struct ext2_ext_attr_header *from_header = 89 (struct ext2_ext_attr_header *)from; 90 struct ext2_ext_attr_header *to_header = 91 (struct ext2_ext_attr_header *)to; 92 struct ext2_ext_attr_entry *from_entry, *to_entry; 93 char *from_end = (char *)from_header + bufsize; 94 int n; 95 96 if (to_header != from_header) 97 memcpy(to_header, from_header, bufsize); 98 99 from_entry = (struct ext2_ext_attr_entry *)from_header; 100 to_entry = (struct ext2_ext_attr_entry *)to_header; 101 102 if (has_header) { 103 to_header->h_magic = ext2fs_swab32(from_header->h_magic); 104 to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); 105 to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); 106 for (n=0; n<4; n++) 107 to_header->h_reserved[n] = 108 ext2fs_swab32(from_header->h_reserved[n]); 109 from_entry = (struct ext2_ext_attr_entry *)(from_header+1); 110 to_entry = (struct ext2_ext_attr_entry *)(to_header+1); 111 } 112 113 while ((char *)from_entry < from_end && *(__u32 *)from_entry) { 114 to_entry->e_value_offs = 115 ext2fs_swab16(from_entry->e_value_offs); 116 to_entry->e_value_block = 117 ext2fs_swab32(from_entry->e_value_block); 118 to_entry->e_value_size = 119 ext2fs_swab32(from_entry->e_value_size); 120 from_entry = EXT2_EXT_ATTR_NEXT(from_entry); 121 to_entry = EXT2_EXT_ATTR_NEXT(to_entry); 122 } 123} 124 125void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, 126 struct ext2_inode_large *f, int hostorder, 127 int bufsize) 128{ 129 unsigned i; 130 int islnk = 0; 131 __u32 *eaf, *eat; 132 133 if (hostorder && LINUX_S_ISLNK(f->i_mode)) 134 islnk = 1; 135 t->i_mode = ext2fs_swab16(f->i_mode); 136 if (!hostorder && LINUX_S_ISLNK(t->i_mode)) 137 islnk = 1; 138 t->i_uid = ext2fs_swab16(f->i_uid); 139 t->i_size = ext2fs_swab32(f->i_size); 140 t->i_atime = ext2fs_swab32(f->i_atime); 141 t->i_ctime = ext2fs_swab32(f->i_ctime); 142 t->i_mtime = ext2fs_swab32(f->i_mtime); 143 t->i_dtime = ext2fs_swab32(f->i_dtime); 144 t->i_gid = ext2fs_swab16(f->i_gid); 145 t->i_links_count = ext2fs_swab16(f->i_links_count); 146 t->i_blocks = ext2fs_swab32(f->i_blocks); 147 t->i_flags = ext2fs_swab32(f->i_flags); 148 t->i_file_acl = ext2fs_swab32(f->i_file_acl); 149 t->i_dir_acl = ext2fs_swab32(f->i_dir_acl); 150 if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) { 151 for (i = 0; i < EXT2_N_BLOCKS; i++) 152 t->i_block[i] = ext2fs_swab32(f->i_block[i]); 153 } else if (t != f) { 154 for (i = 0; i < EXT2_N_BLOCKS; i++) 155 t->i_block[i] = f->i_block[i]; 156 } 157 t->i_generation = ext2fs_swab32(f->i_generation); 158 t->i_faddr = ext2fs_swab32(f->i_faddr); 159 160 switch (fs->super->s_creator_os) { 161 case EXT2_OS_LINUX: 162 t->osd1.linux1.l_i_reserved1 = 163 ext2fs_swab32(f->osd1.linux1.l_i_reserved1); 164 t->osd2.linux2.l_i_blocks_hi = 165 ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi); 166 t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1); 167 t->osd2.linux2.l_i_uid_high = 168 ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); 169 t->osd2.linux2.l_i_gid_high = 170 ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); 171 t->osd2.linux2.l_i_reserved2 = 172 ext2fs_swab32(f->osd2.linux2.l_i_reserved2); 173 break; 174 case EXT2_OS_HURD: 175 t->osd1.hurd1.h_i_translator = 176 ext2fs_swab32 (f->osd1.hurd1.h_i_translator); 177 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; 178 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; 179 t->osd2.hurd2.h_i_mode_high = 180 ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); 181 t->osd2.hurd2.h_i_uid_high = 182 ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); 183 t->osd2.hurd2.h_i_gid_high = 184 ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); 185 t->osd2.hurd2.h_i_author = 186 ext2fs_swab32 (f->osd2.hurd2.h_i_author); 187 break; 188 case EXT2_OS_MASIX: 189 t->osd1.masix1.m_i_reserved1 = 190 ext2fs_swab32(f->osd1.masix1.m_i_reserved1); 191 t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag; 192 t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize; 193 t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1); 194 t->osd2.masix2.m_i_reserved2[0] = 195 ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]); 196 t->osd2.masix2.m_i_reserved2[1] = 197 ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]); 198 break; 199 } 200 201 if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) 202 return; /* no i_extra_isize field */ 203 204 t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); 205 if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) - 206 sizeof(struct ext2_inode)) { 207 /* this is error case: i_extra_size is too large */ 208 return; 209 } 210 211 i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32); 212 if (bufsize < (int) i) 213 return; /* no space for EA magic */ 214 215 eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + 216 f->i_extra_isize); 217 218 if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC) 219 return; /* it seems no magic here */ 220 221 eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + 222 f->i_extra_isize); 223 *eat = ext2fs_swab32(*eaf); 224 225 /* convert EA(s) */ 226 ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), 227 bufsize - sizeof(struct ext2_inode) - 228 t->i_extra_isize - sizeof(__u32), 0); 229 230} 231 232void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t, 233 struct ext2_inode *f, int hostorder) 234{ 235 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t, 236 (struct ext2_inode_large *) f, hostorder, 237 sizeof(struct ext2_inode)); 238} 239 240#endif 241