lib/ext2fs/swapfs.c

   1 /*
   2  * swapfs.c --- swap ext2 filesystem data structures
   3  *
   4  * Copyright (C) 1995, 1996 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 <time.h>
  17
  18 #include <linux/ext2_fs.h>
  19
  20 #include "ext2fs.h"
  21
  22 void ext2fs_swap_super(struct ext2_super_block * super)
  23 {
  24         struct ext2fs_sb *s = (struct ext2fs_sb *) super;
  25
  26         super->s_inodes_count = ext2fs_swab32(super->s_inodes_count);
  27         super->s_blocks_count = ext2fs_swab32(super->s_blocks_count);
  28         super->s_r_blocks_count = ext2fs_swab32(super->s_r_blocks_count);
  29         super->s_free_blocks_count = ext2fs_swab32(super->s_free_blocks_count);
  30         super->s_free_inodes_count = ext2fs_swab32(super->s_free_inodes_count);
  31         super->s_first_data_block = ext2fs_swab32(super->s_first_data_block);
  32         super->s_log_block_size = ext2fs_swab32(super->s_log_block_size);
  33         super->s_log_frag_size = ext2fs_swab32(super->s_log_frag_size);
  34         super->s_blocks_per_group = ext2fs_swab32(super->s_blocks_per_group);
  35         super->s_frags_per_group = ext2fs_swab32(super->s_frags_per_group);
  36         super->s_inodes_per_group = ext2fs_swab32(super->s_inodes_per_group);
  37         super->s_mtime = ext2fs_swab32(super->s_mtime);
  38         super->s_wtime = ext2fs_swab32(super->s_wtime);
  39         super->s_mnt_count = ext2fs_swab16(super->s_mnt_count);
  40         super->s_max_mnt_count = ext2fs_swab16(super->s_max_mnt_count);
  41         super->s_magic = ext2fs_swab16(super->s_magic);
  42         super->s_state = ext2fs_swab16(super->s_state);
  43         super->s_errors = ext2fs_swab16(super->s_errors);
  44         s->s_minor_rev_level = ext2fs_swab16(s->s_minor_rev_level);
  45         super->s_lastcheck = ext2fs_swab32(super->s_lastcheck);
  46         super->s_checkinterval = ext2fs_swab32(super->s_checkinterval);
  47         super->s_creator_os = ext2fs_swab32(super->s_creator_os);
  48         super->s_rev_level = ext2fs_swab32(super->s_rev_level);
  49 #ifdef  EXT2_DEF_RESUID
  50         super->s_def_resuid = ext2fs_swab16(super->s_def_resuid);
  51         super->s_def_resgid = ext2fs_swab16(super->s_def_resgid);
  52 #endif
  53         s->s_first_ino = ext2fs_swab32(s->s_first_ino);
  54         s->s_inode_size = ext2fs_swab16(s->s_inode_size);
  55         s->s_block_group_nr = ext2fs_swab16(s->s_block_group_nr);
  56         s->s_feature_compat = ext2fs_swab32(s->s_feature_compat);
  57         s->s_feature_incompat = ext2fs_swab32(s->s_feature_incompat);
  58         s->s_feature_ro_compat = ext2fs_swab32(s->s_feature_ro_compat);
  59 }
  60
  61 void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
  62 {
  63         gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
  64         gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
  65         gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
  66         gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
  67         gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
  68         gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
  69 }
  70
  71 void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
  72                        struct ext2_inode *f, int hostorder)
  73 {
  74         unsigned i;
  75         int islnk = 0;
  76
  77         if (hostorder && LINUX_S_ISLNK(f->i_mode))
  78                 islnk = 1;
  79         t->i_mode = ext2fs_swab16(f->i_mode);
  80         if (!hostorder && LINUX_S_ISLNK(t->i_mode))
  81                 islnk = 1;
  82         t->i_uid = ext2fs_swab16(f->i_uid);
  83         t->i_size = ext2fs_swab32(f->i_size);
  84         t->i_atime = ext2fs_swab32(f->i_atime);
  85         t->i_ctime = ext2fs_swab32(f->i_ctime);
  86         t->i_mtime = ext2fs_swab32(f->i_mtime);
  87         t->i_dtime = ext2fs_swab32(f->i_dtime);
  88         t->i_gid = ext2fs_swab16(f->i_gid);
  89         t->i_links_count = ext2fs_swab16(f->i_links_count);
  90         t->i_blocks = ext2fs_swab32(f->i_blocks);
  91         t->i_flags = ext2fs_swab32(f->i_flags);
  92         if (!islnk || f->i_blocks) {
  93                 for (i = 0; i < EXT2_N_BLOCKS; i++)
  94                         t->i_block[i] = ext2fs_swab32(f->i_block[i]);
  95         } else if (t != f) {
  96                 for (i = 0; i < EXT2_N_BLOCKS; i++)
  97                         t->i_block[i] = f->i_block[i];
  98         }
  99         t->i_version = ext2fs_swab32(f->i_version);
 100         t->i_file_acl = ext2fs_swab32(f->i_file_acl);
 101         t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
 102         t->i_faddr = ext2fs_swab32(f->i_faddr);
 103
 104         switch (fs->super->s_creator_os) {
 105         case EXT2_OS_LINUX:
 106                 t->osd1.linux1.l_i_reserved1 =
 107                         ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
 108                 t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
 109                 t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
 110                 t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
 111                 t->osd2.linux2.l_i_reserved2[0] =
 112                         ext2fs_swab32(f->osd2.linux2.l_i_reserved2[0]);
 113                 t->osd2.linux2.l_i_reserved2[1] =
 114                         ext2fs_swab32(f->osd2.linux2.l_i_reserved2[1]);
 115                 break;
 116         case EXT2_OS_HURD:
 117                 t->osd1.hurd1.h_i_translator =
 118                   ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
 119                 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
 120                 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
 121                 t->osd2.hurd2.h_i_mode_high =
 122                   ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
 123                 t->osd2.hurd2.h_i_uid_high =
 124                   ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
 125                 t->osd2.hurd2.h_i_gid_high =
 126                   ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
 127                 t->osd2.hurd2.h_i_author =
 128                   ext2fs_swab32 (f->osd2.hurd2.h_i_author);
 129                 break;
 130         case EXT2_OS_MASIX:
 131                 t->osd1.masix1.m_i_reserved1 =
 132                         ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
 133                 t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
 134                 t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
 135                 t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
 136                 t->osd2.masix2.m_i_reserved2[0] =
 137                         ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
 138                 t->osd2.masix2.m_i_reserved2[1] =
 139                         ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
 140                 break;
 141         }
 142 }
 143