e2fsprogs/old_e2fsprogs/ext2fs/swapfs.c

   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
  23 void 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 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 void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
 227                        struct ext2_inode *f, int hostorder)
 228 {
 229         ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
 230                                 (struct ext2_inode_large *) f, hostorder,
 231                                 sizeof(struct ext2_inode));
 232 }
 233
 234 #endif