lib/ext2fs/swapfs.c

   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 Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #if HAVE_UNISTD_H
  15 #include <unistd.h>
  16 #endif
  17 #include <string.h>
  18 #include <time.h>
  19
  20 #include "ext2_fs.h"
  21 #include "ext2fs.h"
  22 #include "ext2fsP.h"
  23 #include <ext2fs/ext2_ext_attr.h>
  24
  25 #ifdef WORDS_BIGENDIAN
  26 void ext2fs_swap_super(struct ext2_super_block * sb)
  27 {
  28         int i;
  29
  30         sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
  31         sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
  32         sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
  33         sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
  34         sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
  35         sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
  36         sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
  37         sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size);
  38         sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
  39         sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group);
  40         sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
  41         sb->s_mtime = ext2fs_swab32(sb->s_mtime);
  42         sb->s_wtime = ext2fs_swab32(sb->s_wtime);
  43         sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
  44         sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
  45         sb->s_magic = ext2fs_swab16(sb->s_magic);
  46         sb->s_state = ext2fs_swab16(sb->s_state);
  47         sb->s_errors = ext2fs_swab16(sb->s_errors);
  48         sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
  49         sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
  50         sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
  51         sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
  52         sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
  53         sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
  54         sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
  55         sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
  56         sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
  57         sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
  58         sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
  59         sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
  60         sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
  61         /* sb->s_uuid is __u8 and does not need swabbing */
  62         /* sb->s_volume_name is char and does not need swabbing */
  63         /* sb->s_last_mounted is char and does not need swabbing */
  64         sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
  65         /* sb->s_prealloc_blocks is __u8 and does not need swabbing */
  66         /* sb->s_prealloc_dir_blocks is __u8 and does not need swabbing */
  67         sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
  68         /* sb->s_journal_uuid is __u8 and does not need swabbing */
  69         sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
  70         sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
  71         sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
  72         for (i = 0; i < 4; i++)
  73                 sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
  74         /* sb->s_def_hash_version is __u8 and does not need swabbing */
  75         /* sb->s_jnl_backup_type is __u8 and does not need swabbing */
  76         sb->s_desc_size = ext2fs_swab16(sb->s_desc_size);
  77         sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
  78         sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
  79         sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
  80         /* if journal backup is for a valid extent-based journal... */
  81         if (ext2fs_extent_header_verify(sb->s_jnl_blocks,
  82                                         sizeof(sb->s_jnl_blocks)) == 0) {
  83                 /* ... swap only the journal i_size and i_size_high,
  84                  * and the extent data is not swapped on read */
  85                 i = 15;
  86         } else {
  87                 /* direct/indirect journal: swap it all */
  88                 i = 0;
  89         }
  90         for (; i < 17; i++)
  91                 sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
  92         sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi);
  93         sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi);
  94         sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi);
  95         sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize);
  96         sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize);
  97         sb->s_flags = ext2fs_swab32(sb->s_flags);
  98         sb->s_raid_stride = ext2fs_swab16(sb->s_raid_stride);
  99         sb->s_mmp_update_interval = ext2fs_swab16(sb->s_mmp_update_interval);
 100         sb->s_mmp_block = ext2fs_swab64(sb->s_mmp_block);
 101         sb->s_raid_stripe_width = ext2fs_swab32(sb->s_raid_stripe_width);
 102         /* sb->s_log_groups_per_flex is __u8 and does not need swabbing */
 103         /* sb->s_checksum_type is __u8 and does not need swabbing */
 104         /* sb->s_encryption_level is __u8 and does not need swabbing */
 105         /* sb->s_reserved_pad is __u8 and does not need swabbing */
 106         sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written);
 107         sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum);
 108         sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id);
 109         sb->s_snapshot_r_blocks_count =
 110                 ext2fs_swab64(sb->s_snapshot_r_blocks_count);
 111         sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list);
 112         sb->s_error_count = ext2fs_swab32(sb->s_error_count);
 113         sb->s_first_error_time = ext2fs_swab32(sb->s_first_error_time);
 114         sb->s_first_error_ino = ext2fs_swab32(sb->s_first_error_ino);
 115         sb->s_first_error_block = ext2fs_swab64(sb->s_first_error_block);
 116         /* sb->s_first_error_func is __u8 and does not need swabbing */
 117         sb->s_last_error_time = ext2fs_swab32(sb->s_last_error_time);
 118         sb->s_last_error_ino = ext2fs_swab32(sb->s_last_error_ino);
 119         sb->s_last_error_block = ext2fs_swab64(sb->s_last_error_block);
 120         /* sb->s_last_error_func is __u8 and does not need swabbing */
 121         /* sb->s_mount_opts is __u8 and does not need swabbing */
 122         sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum);
 123         sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum);
 124         sb->s_overhead_blocks = ext2fs_swab32(sb->s_overhead_blocks);
 125         sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]);
 126         sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]);
 127         /* sb->s_encrypt_algos is __u8 and does not need swabbing */
 128         /* sb->s_encrypt_pw_salt is __u8 and does not need swabbing */
 129         sb->s_lpf_ino = ext2fs_swab32(sb->s_lpf_ino);
 130         sb->s_prj_quota_inum = ext2fs_swab32(sb->s_prj_quota_inum);
 131         sb->s_checksum_seed = ext2fs_swab32(sb->s_checksum_seed);
 132         /* catch when new fields are used from s_reserved */
 133         EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 98 * sizeof(__le32));
 134         sb->s_checksum = ext2fs_swab32(sb->s_checksum);
 135 }
 136
 137 void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
 138 {
 139         struct ext4_group_desc *gdp4 = (struct ext4_group_desc *)gdp;
 140
 141         /* Do the 32-bit parts first */
 142         gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
 143         gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
 144         gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
 145         gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
 146         gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
 147         gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
 148         gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
 149         gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo);
 150         gdp->bg_block_bitmap_csum_lo =
 151                 ext2fs_swab16(gdp->bg_block_bitmap_csum_lo);
 152         gdp->bg_inode_bitmap_csum_lo =
 153                 ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo);
 154         gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
 155         gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
 156         /* If we're 32-bit, we're done */
 157         if (fs == NULL || EXT2_DESC_SIZE(fs->super) < EXT2_MIN_DESC_SIZE_64BIT)
 158                 return;
 159
 160         /* Swap the 64-bit parts */
 161         gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi);
 162         gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi);
 163         gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi);
 164         gdp4->bg_free_blocks_count_hi =
 165                 ext2fs_swab16(gdp4->bg_free_blocks_count_hi);
 166         gdp4->bg_free_inodes_count_hi =
 167                 ext2fs_swab16(gdp4->bg_free_inodes_count_hi);
 168         gdp4->bg_used_dirs_count_hi =
 169                 ext2fs_swab16(gdp4->bg_used_dirs_count_hi);
 170         gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi);
 171         gdp4->bg_exclude_bitmap_hi = ext2fs_swab16(gdp4->bg_exclude_bitmap_hi);
 172         gdp4->bg_block_bitmap_csum_hi =
 173                 ext2fs_swab16(gdp4->bg_block_bitmap_csum_hi);
 174         gdp4->bg_inode_bitmap_csum_hi =
 175                 ext2fs_swab16(gdp4->bg_inode_bitmap_csum_hi);
 176         EXT2FS_BUILD_BUG_ON(sizeof(gdp4->bg_reserved) != sizeof(__u32));
 177 }
 178
 179 void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
 180 {
 181         ext2fs_swap_group_desc2(0, gdp);
 182 }
 183
 184
 185 void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header,
 186                                  struct ext2_ext_attr_header *from_header)
 187 {
 188         int n;
 189
 190         to_header->h_magic    = ext2fs_swab32(from_header->h_magic);
 191         to_header->h_blocks   = ext2fs_swab32(from_header->h_blocks);
 192         to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
 193         to_header->h_hash     = ext2fs_swab32(from_header->h_hash);
 194         to_header->h_checksum = ext2fs_swab32(from_header->h_checksum);
 195         for (n = 0; n < 3; n++)
 196                 to_header->h_reserved[n] =
 197                         ext2fs_swab32(from_header->h_reserved[n]);
 198 }
 199
 200 void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry,
 201                                 struct ext2_ext_attr_entry *from_entry)
 202 {
 203         to_entry->e_value_offs  = ext2fs_swab16(from_entry->e_value_offs);
 204         to_entry->e_value_inum  = ext2fs_swab32(from_entry->e_value_inum);
 205         to_entry->e_value_size  = ext2fs_swab32(from_entry->e_value_size);
 206         to_entry->e_hash        = ext2fs_swab32(from_entry->e_hash);
 207 }
 208
 209 void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
 210 {
 211         struct ext2_ext_attr_header *from_header =
 212                 (struct ext2_ext_attr_header *)from;
 213         struct ext2_ext_attr_header *to_header =
 214                 (struct ext2_ext_attr_header *)to;
 215         struct ext2_ext_attr_entry *from_entry, *to_entry;
 216         char *from_end = (char *)from_header + bufsize;
 217
 218         if (to_header != from_header)
 219                 memcpy(to_header, from_header, bufsize);
 220
 221         if (has_header) {
 222                 ext2fs_swap_ext_attr_header(to_header, from_header);
 223
 224                 from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
 225                 to_entry   = (struct ext2_ext_attr_entry *)(to_header+1);
 226         } else {
 227                 from_entry = (struct ext2_ext_attr_entry *)from_header;
 228                 to_entry   = (struct ext2_ext_attr_entry *)to_header;
 229         }
 230
 231         while ((char *)from_entry < from_end &&
 232                (char *)EXT2_EXT_ATTR_NEXT(from_entry) <= from_end &&
 233                *(__u32 *)from_entry) {
 234                 ext2fs_swap_ext_attr_entry(to_entry, from_entry);
 235                 from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
 236                 to_entry   = EXT2_EXT_ATTR_NEXT(to_entry);
 237         }
 238 }
 239
 240 void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
 241                             struct ext2_inode_large *f, int hostorder,
 242                             int bufsize)
 243 {
 244         unsigned i, extra_isize, attr_magic;
 245         int has_extents, has_inline_data, islnk, fast_symlink;
 246         int inode_size;
 247         __u32 *eaf, *eat;
 248
 249         /*
 250          * Note that t and f may point to the same address. That's why
 251          * if (hostorder) condition is executed before swab calls and
 252          * if (!hostorder) afterwards.
 253          */
 254         if (hostorder) {
 255                 islnk = LINUX_S_ISLNK(f->i_mode);
 256                 fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(f));
 257                 has_extents = (f->i_flags & EXT4_EXTENTS_FL) != 0;
 258                 has_inline_data = (f->i_flags & EXT4_INLINE_DATA_FL) != 0;
 259         }
 260
 261         t->i_mode = ext2fs_swab16(f->i_mode);
 262         t->i_uid = ext2fs_swab16(f->i_uid);
 263         t->i_size = ext2fs_swab32(f->i_size);
 264         t->i_atime = ext2fs_swab32(f->i_atime);
 265         t->i_ctime = ext2fs_swab32(f->i_ctime);
 266         t->i_mtime = ext2fs_swab32(f->i_mtime);
 267         t->i_dtime = ext2fs_swab32(f->i_dtime);
 268         t->i_gid = ext2fs_swab16(f->i_gid);
 269         t->i_links_count = ext2fs_swab16(f->i_links_count);
 270         t->i_file_acl = ext2fs_swab32(f->i_file_acl);
 271         t->i_blocks = ext2fs_swab32(f->i_blocks);
 272         t->i_flags = ext2fs_swab32(f->i_flags);
 273         t->i_size_high = ext2fs_swab32(f->i_size_high);
 274
 275         if (!hostorder) {
 276                 islnk = LINUX_S_ISLNK(t->i_mode);
 277                 fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(t));
 278                 has_extents = (t->i_flags & EXT4_EXTENTS_FL) != 0;
 279                 has_inline_data = (t->i_flags & EXT4_INLINE_DATA_FL) != 0;
 280         }
 281
 282         /*
 283          * Extent data and inline data are swapped on access, not here
 284          */
 285         if (!has_extents && !has_inline_data && (!islnk || !fast_symlink)) {
 286                 for (i = 0; i < EXT2_N_BLOCKS; i++)
 287                         t->i_block[i] = ext2fs_swab32(f->i_block[i]);
 288         } else if (t != f) {
 289                 for (i = 0; i < EXT2_N_BLOCKS; i++)
 290                         t->i_block[i] = f->i_block[i];
 291         }
 292         t->i_generation = ext2fs_swab32(f->i_generation);
 293         t->i_faddr = ext2fs_swab32(f->i_faddr);
 294
 295         switch (fs->super->s_creator_os) {
 296         case EXT2_OS_LINUX:
 297                 t->osd1.linux1.l_i_version =
 298                         ext2fs_swab32(f->osd1.linux1.l_i_version);
 299                 t->osd2.linux2.l_i_blocks_hi =
 300                         ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi);
 301                 t->osd2.linux2.l_i_file_acl_high =
 302                         ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high);
 303                 t->osd2.linux2.l_i_uid_high =
 304                   ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
 305                 t->osd2.linux2.l_i_gid_high =
 306                   ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
 307                 t->osd2.linux2.l_i_checksum_lo =
 308                         ext2fs_swab16(f->osd2.linux2.l_i_checksum_lo);
 309                 break;
 310         case EXT2_OS_HURD:
 311                 t->osd1.hurd1.h_i_translator =
 312                   ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
 313                 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
 314                 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
 315                 t->osd2.hurd2.h_i_mode_high =
 316                   ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
 317                 t->osd2.hurd2.h_i_uid_high =
 318                   ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
 319                 t->osd2.hurd2.h_i_gid_high =
 320                   ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
 321                 t->osd2.hurd2.h_i_author =
 322                   ext2fs_swab32 (f->osd2.hurd2.h_i_author);
 323                 break;
 324         default:
 325                 break;
 326         }
 327
 328         if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
 329                 return; /* no i_extra_isize field */
 330
 331         if (hostorder)
 332                 extra_isize = f->i_extra_isize;
 333         t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
 334         if (!hostorder)
 335                 extra_isize = t->i_extra_isize;
 336         if (extra_isize > EXT2_INODE_SIZE(fs->super) -
 337                                 sizeof(struct ext2_inode)) {
 338                 /* this is error case: i_extra_size is too large */
 339                 return;
 340         }
 341         if (extra_isize & 3)
 342                 return;         /* Illegal inode extra_isize */
 343
 344         inode_size = EXT2_GOOD_OLD_INODE_SIZE + extra_isize;
 345         if (inode_includes(inode_size, i_checksum_hi))
 346                 t->i_checksum_hi = ext2fs_swab16(f->i_checksum_hi);
 347         if (inode_includes(inode_size, i_ctime_extra))
 348                 t->i_ctime_extra = ext2fs_swab32(f->i_ctime_extra);
 349         if (inode_includes(inode_size, i_mtime_extra))
 350                 t->i_mtime_extra = ext2fs_swab32(f->i_mtime_extra);
 351         if (inode_includes(inode_size, i_atime_extra))
 352                 t->i_atime_extra = ext2fs_swab32(f->i_atime_extra);
 353         if (inode_includes(inode_size, i_crtime))
 354                 t->i_crtime = ext2fs_swab32(f->i_crtime);
 355         if (inode_includes(inode_size, i_crtime_extra))
 356                 t->i_crtime_extra = ext2fs_swab32(f->i_crtime_extra);
 357         if (inode_includes(inode_size, i_version_hi))
 358                 t->i_version_hi = ext2fs_swab32(f->i_version_hi);
 359         if (inode_includes(inode_size, i_projid))
 360                 t->i_projid = ext2fs_swab16(f->i_projid);
 361         /* catch new static fields added after i_projid */
 362         EXT2FS_BUILD_BUG_ON(sizeof(struct ext2_inode_large) != 160);
 363
 364         i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32);
 365         if (bufsize < (int) i)
 366                 return; /* no space for EA magic */
 367
 368         eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
 369                                         extra_isize);
 370
 371         attr_magic = *eaf;
 372         if (!hostorder)
 373                 attr_magic = ext2fs_swab32(attr_magic);
 374
 375         if (attr_magic != EXT2_EXT_ATTR_MAGIC)
 376                 return; /* it seems no magic here */
 377
 378         eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
 379                                         extra_isize);
 380         *eat = ext2fs_swab32(*eaf);
 381
 382         /* convert EA(s) */
 383         ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
 384                              bufsize - sizeof(struct ext2_inode) -
 385                              extra_isize - sizeof(__u32), 0);
 386
 387 }
 388
 389 void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
 390                        struct ext2_inode *f, int hostorder)
 391 {
 392         ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
 393                                 (struct ext2_inode_large *) f, hostorder,
 394                                 sizeof(struct ext2_inode));
 395 }
 396
 397 void ext2fs_swap_mmp(struct mmp_struct *mmp)
 398 {
 399         mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic);
 400         mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq);
 401         mmp->mmp_time = ext2fs_swab64(mmp->mmp_time);
 402         mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval);
 403         mmp->mmp_checksum = ext2fs_swab32(mmp->mmp_checksum);
 404 }
 405
 406 errcode_t ext2fs_dirent_swab_in(ext2_filsys fs, char *buf, int flags)
 407 {
 408         return ext2fs_dirent_swab_in2(fs, buf, fs->blocksize, flags);
 409 }
 410
 411 errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf,
 412                                  size_t size, int flags)
 413 {
 414         errcode_t       retval;
 415         char            *p, *end;
 416         struct ext2_dir_entry *dirent;
 417         unsigned int    name_len, rec_len;
 418
 419         p = (char *) buf;
 420         end = (char *) buf + size;
 421         while (p < end-8) {
 422                 dirent = (struct ext2_dir_entry *) p;
 423                 dirent->inode = ext2fs_swab32(dirent->inode);
 424                 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
 425                 dirent->name_len = ext2fs_swab16(dirent->name_len);
 426                 name_len = dirent->name_len;
 427                 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
 428                         dirent->name_len = ext2fs_swab16(dirent->name_len);
 429                 retval = ext2fs_get_rec_len(fs, dirent, &rec_len);
 430                 if (retval)
 431                         return retval;
 432                 if ((rec_len < 8) || (rec_len % 4)) {
 433                         rec_len = 8;
 434                         retval = EXT2_ET_DIR_CORRUPTED;
 435                 } else if (((name_len & 0xFF) + 8) > rec_len)
 436                         retval = EXT2_ET_DIR_CORRUPTED;
 437                 p += rec_len;
 438         }
 439
 440         return 0;
 441 }
 442
 443 errcode_t ext2fs_dirent_swab_out(ext2_filsys fs, char *buf, int flags)
 444 {
 445         return ext2fs_dirent_swab_out2(fs, buf, fs->blocksize, flags);
 446 }
 447
 448 errcode_t ext2fs_dirent_swab_out2(ext2_filsys fs, char *buf,
 449                                   size_t size, int flags)
 450 {
 451         errcode_t       retval;
 452         char            *p, *end;
 453         unsigned int    rec_len;
 454         struct ext2_dir_entry *dirent;
 455
 456         p = buf;
 457         end = buf + size;
 458         while (p < end) {
 459                 dirent = (struct ext2_dir_entry *) p;
 460                 retval = ext2fs_get_rec_len(fs, dirent, &rec_len);
 461                 if (retval)
 462                         return retval;
 463                 if ((rec_len < 8) ||
 464                     (rec_len % 4)) {
 465                         ext2fs_free_mem(&buf);
 466                         return EXT2_ET_DIR_CORRUPTED;
 467                 }
 468                 p += rec_len;
 469                 dirent->inode = ext2fs_swab32(dirent->inode);
 470                 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
 471                 dirent->name_len = ext2fs_swab16(dirent->name_len);
 472
 473                 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
 474                         dirent->name_len = ext2fs_swab16(dirent->name_len);
 475         }
 476
 477         return 0;
 478 }
 479
 480 #endif