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/*
* swapfs.c --- swap ext2 filesystem data structures
*
* Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include <time.h>
#include "ext2_fs.h"
#include "ext2fs.h"
#include <ext2fs/ext2_ext_attr.h>
#ifdef WORDS_BIGENDIAN
void ext2fs_swap_super(struct ext2_super_block * sb)
{
int i;
sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size);
sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group);
sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
sb->s_mtime = ext2fs_swab32(sb->s_mtime);
sb->s_wtime = ext2fs_swab32(sb->s_wtime);
sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
sb->s_magic = ext2fs_swab16(sb->s_magic);
sb->s_state = ext2fs_swab16(sb->s_state);
sb->s_errors = ext2fs_swab16(sb->s_errors);
sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
sb->s_desc_size = ext2fs_swab16(sb->s_desc_size);
sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi);
sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi);
sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi);
sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize);
sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize);
sb->s_flags = ext2fs_swab32(sb->s_flags);
sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written);
sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum);
sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id);
sb->s_snapshot_r_blocks_count =
ext2fs_swab64(sb->s_snapshot_r_blocks_count);
sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list);
sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum);
sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum);
for (i=0; i < 4; i++)
sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
/* if journal backup is for a valid extent-based journal... */
if (!ext2fs_extent_header_verify(sb->s_jnl_blocks,
sizeof(sb->s_jnl_blocks))) {
/* ... swap only the journal i_size */
sb->s_jnl_blocks[16] = ext2fs_swab32(sb->s_jnl_blocks[16]);
/* and the extent data is not swapped on read */
return;
}
/* direct/indirect journal: swap it all */
for (i=0; i < 17; i++)
sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
}
void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
{
gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
}
void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header,
struct ext2_ext_attr_header *from_header)
{
int n;
to_header->h_magic = ext2fs_swab32(from_header->h_magic);
to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
to_header->h_hash = ext2fs_swab32(from_header->h_hash);
for (n = 0; n < 4; n++)
to_header->h_reserved[n] =
ext2fs_swab32(from_header->h_reserved[n]);
}
void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry,
struct ext2_ext_attr_entry *from_entry)
{
to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs);
to_entry->e_value_block = ext2fs_swab32(from_entry->e_value_block);
to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size);
to_entry->e_hash = ext2fs_swab32(from_entry->e_hash);
}
void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
{
struct ext2_ext_attr_header *from_header =
(struct ext2_ext_attr_header *)from;
struct ext2_ext_attr_header *to_header =
(struct ext2_ext_attr_header *)to;
struct ext2_ext_attr_entry *from_entry, *to_entry;
char *from_end = (char *)from_header + bufsize;
if (to_header != from_header)
memcpy(to_header, from_header, bufsize);
if (has_header) {
ext2fs_swap_ext_attr_header(to_header, from_header);
from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
} else {
from_entry = (struct ext2_ext_attr_entry *)from_header;
to_entry = (struct ext2_ext_attr_entry *)to_header;
}
while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
ext2fs_swap_ext_attr_entry(to_entry, from_entry);
from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
}
}
void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
struct ext2_inode_large *f, int hostorder,
int bufsize)
{
unsigned i, has_data_blocks, extra_isize, attr_magic;
int has_extents = 0;
int islnk = 0;
__u32 *eaf, *eat;
if (hostorder && LINUX_S_ISLNK(f->i_mode))
islnk = 1;
t->i_mode = ext2fs_swab16(f->i_mode);
if (!hostorder && LINUX_S_ISLNK(t->i_mode))
islnk = 1;
t->i_uid = ext2fs_swab16(f->i_uid);
t->i_size = ext2fs_swab32(f->i_size);
t->i_atime = ext2fs_swab32(f->i_atime);
t->i_ctime = ext2fs_swab32(f->i_ctime);
t->i_mtime = ext2fs_swab32(f->i_mtime);
t->i_dtime = ext2fs_swab32(f->i_dtime);
t->i_gid = ext2fs_swab16(f->i_gid);
t->i_links_count = ext2fs_swab16(f->i_links_count);
t->i_file_acl = ext2fs_swab32(f->i_file_acl);
if (hostorder)
has_data_blocks = ext2fs_inode_data_blocks(fs,
(struct ext2_inode *) f);
t->i_blocks = ext2fs_swab32(f->i_blocks);
if (!hostorder)
has_data_blocks = ext2fs_inode_data_blocks(fs,
(struct ext2_inode *) t);
if (hostorder && (f->i_flags & EXT4_EXTENTS_FL))
has_extents = 1;
t->i_flags = ext2fs_swab32(f->i_flags);
if (!hostorder && (t->i_flags & EXT4_EXTENTS_FL))
has_extents = 1;
t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
/* extent data are swapped on access, not here */
if (!has_extents && (!islnk || has_data_blocks)) {
for (i = 0; i < EXT2_N_BLOCKS; i++)
t->i_block[i] = ext2fs_swab32(f->i_block[i]);
} else if (t != f) {
for (i = 0; i < EXT2_N_BLOCKS; i++)
t->i_block[i] = f->i_block[i];
}
t->i_generation = ext2fs_swab32(f->i_generation);
t->i_faddr = ext2fs_swab32(f->i_faddr);
switch (fs->super->s_creator_os) {
case EXT2_OS_LINUX:
t->osd1.linux1.l_i_version =
ext2fs_swab32(f->osd1.linux1.l_i_version);
t->osd2.linux2.l_i_blocks_hi =
ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi);
t->osd2.linux2.l_i_file_acl_high =
ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high);
t->osd2.linux2.l_i_uid_high =
ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
t->osd2.linux2.l_i_gid_high =
ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
t->osd2.linux2.l_i_reserved2 =
ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
break;
case EXT2_OS_HURD:
t->osd1.hurd1.h_i_translator =
ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
t->osd2.hurd2.h_i_mode_high =
ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
t->osd2.hurd2.h_i_uid_high =
ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
t->osd2.hurd2.h_i_gid_high =
ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
t->osd2.hurd2.h_i_author =
ext2fs_swab32 (f->osd2.hurd2.h_i_author);
break;
default:
break;
}
if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
return; /* no i_extra_isize field */
if (hostorder)
extra_isize = f->i_extra_isize;
t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
if (!hostorder)
extra_isize = t->i_extra_isize;
if (extra_isize > EXT2_INODE_SIZE(fs->super) -
sizeof(struct ext2_inode)) {
/* this is error case: i_extra_size is too large */
return;
}
i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32);
if (bufsize < (int) i)
return; /* no space for EA magic */
eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
extra_isize);
attr_magic = *eaf;
if (!hostorder)
attr_magic = ext2fs_swab32(attr_magic);
if (attr_magic != EXT2_EXT_ATTR_MAGIC)
return; /* it seems no magic here */
eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
extra_isize);
*eat = ext2fs_swab32(*eaf);
/* convert EA(s) */
ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
bufsize - sizeof(struct ext2_inode) -
extra_isize - sizeof(__u32), 0);
}
void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
struct ext2_inode *f, int hostorder)
{
ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
(struct ext2_inode_large *) f, hostorder,
sizeof(struct ext2_inode));
}
#endif
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