/*
* Squashfs - a compressed read only filesystem for Linux
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006
* Phillip Lougher <phillip@lougher.demon.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* squashfs2_0.c
*/
#include <linux/types.h>
#include <linux/squashfs_fs.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/zlib.h>
#include <linux/fs.h>
#include <linux/smp_lock.h>
#include <linux/locks.h>
#include <linux/init.h>
#include <linux/dcache.h>
#include <linux/wait.h>
#include <linux/zlib.h>
#include <linux/blkdev.h>
#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include "squashfs.h"
static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry);
static struct file_operations squashfs_dir_ops_2 = {
.read = generic_read_dir,
.readdir = squashfs_readdir_2
};
static struct inode_operations squashfs_dir_inode_ops_2 = {
.lookup = squashfs_lookup_2
};
static unsigned char squashfs_filetype_table[] = {
DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
};
static int read_fragment_index_table_2(struct super_block *s)
{
struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
(sblk->fragments), GFP_KERNEL))) {
ERROR("Failed to allocate uid/gid table\n");
return 0;
}
if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
!squashfs_read_data(s, (char *)
msblk->fragment_index_2,
sblk->fragment_table_start,
SQUASHFS_FRAGMENT_INDEX_BYTES_2
(sblk->fragments) |
SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
ERROR("unable to read fragment index table\n");
return 0;
}
if (msblk->swap) {
int i;
unsigned int fragment;
for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
i++) {
SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
&msblk->fragment_index_2[i], 1);
msblk->fragment_index_2[i] = fragment;
}
}
return 1;
}
static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
long long *fragment_start_block,
unsigned int *fragment_size)
{
struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
long long start_block =
msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
struct squashfs_fragment_entry_2 fragment_entry;
if (msblk->swap) {
struct squashfs_fragment_entry_2 sfragment_entry;
if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
start_block, offset,
sizeof(sfragment_entry), &start_block,
&offset))
goto out;
SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
} else
if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
start_block, offset,
sizeof(fragment_entry), &start_block,
&offset))
goto out;
*fragment_start_block = fragment_entry.start_block;
*fragment_size = fragment_entry.size;
return 1;
out:
return 0;
}
static struct inode *squashfs_new_inode(struct super_block *s,
struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
{
struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
struct inode *i = new_inode(s);
if (i) {
i->i_ino = ino;
i->i_mtime = sblk->mkfs_time;
i->i_atime = sblk->mkfs_time;
i->i_ctime = sblk->mkfs_time;
i->i_uid = msblk->uid[inodeb->uid];
i->i_mode = inodeb->mode;
i->i_nlink = 1;
i->i_size = 0;
if (inodeb->guid == SQUASHFS_GUIDS)
i->i_gid = i->i_uid;
else
i->i_gid = msblk->guid[inodeb->guid];
}
return i;
}
static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
{
struct inode *i;
struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
unsigned int block = SQUASHFS_INODE_BLK(inode) +
sblk->inode_table_start;
unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
unsigned int ino = SQUASHFS_MK_VFS_INODE(block
- sblk->inode_table_start, offset);
long long next_block;
unsigned int next_offset;
union squashfs_inode_header_2 id, sid;
struct squashfs_base_inode_header_2 *inodeb = &id.base,
*sinodeb = &sid.base;
TRACE("Entered squashfs_iget\n");
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
offset, sizeof(*sinodeb), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
sizeof(*sinodeb));
} else
if (!squashfs_get_cached_block(s, (char *) inodeb, block,
offset, sizeof(*inodeb), &next_block,
&next_offset))
goto failed_read;
switch(inodeb->inode_type) {
case SQUASHFS_FILE_TYPE: {
struct squashfs_reg_inode_header_2 *inodep = &id.reg;
struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
long long frag_blk;
unsigned int frag_size;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
} else
if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
frag_blk = SQUASHFS_INVALID_BLK;
if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
!get_fragment_location_2(s,
inodep->fragment, &frag_blk, &frag_size))
goto failed_read;
if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
goto failed_read1;
i->i_size = inodep->file_size;
i->i_fop = &generic_ro_fops;
i->i_mode |= S_IFREG;
i->i_mtime = inodep->mtime;
i->i_atime = inodep->mtime;
i->i_ctime = inodep->mtime;
i->i_blocks = ((i->i_size - 1) >> 9) + 1;
i->i_blksize = PAGE_CACHE_SIZE;
SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
SQUASHFS_I(i)->start_block = inodep->start_block;
SQUASHFS_I(i)->u.s1.block_list_start = next_block;
SQUASHFS_I(i)->offset = next_offset;
if (sblk->block_size > 4096)
i->i_data.a_ops = &squashfs_aops;
else
i->i_data.a_ops = &squashfs_aops_4K;
TRACE("File inode %x:%x, start_block %x, "
"block_list_start %llx, offset %x\n",
SQUASHFS_INODE_BLK(inode), offset,
inodep->start_block, next_block,
next_offset);
break;
}
case SQUASHFS_DIR_TYPE: {
struct squashfs_dir_inode_header_2 *inodep = &id.dir;
struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
} else
if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
goto failed_read1;
i->i_size = inodep->file_size;
i->i_op = &squashfs_dir_inode_ops_2;
i->i_fop = &squashfs_dir_ops_2;
i->i_mode |= S_IFDIR;
i->i_mtime = inodep->mtime;
i->i_atime = inodep->mtime;
i->i_ctime = inodep->mtime;
SQUASHFS_I(i)->start_block = inodep->start_block;
SQUASHFS_I(i)->offset = inodep->offset;
SQUASHFS_I(i)->u.s2.directory_index_count = 0;
SQUASHFS_I(i)->u.s2.parent_inode = 0;
TRACE("Directory inode %x:%x, start_block %x, offset "
"%x\n", SQUASHFS_INODE_BLK(inode),
offset, inodep->start_block,
inodep->offset);
break;
}
case SQUASHFS_LDIR_TYPE: {
struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
sinodep);
} else
if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
goto failed_read1;
i->i_size = inodep->file_size;
i->i_op = &squashfs_dir_inode_ops_2;
i->i_fop = &squashfs_dir_ops_2;
i->i_mode |= S_IFDIR;
i->i_mtime = inodep->mtime;
i->i_atime = inodep->mtime;
i->i_ctime = inodep->mtime;
SQUASHFS_I(i)->start_block = inodep->start_block;
SQUASHFS_I(i)->offset = inodep->offset;
SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
SQUASHFS_I(i)->u.s2.directory_index_offset =
next_offset;
SQUASHFS_I(i)->u.s2.directory_index_count =
inodep->i_count;
SQUASHFS_I(i)->u.s2.parent_inode = 0;
TRACE("Long directory inode %x:%x, start_block %x, "
"offset %x\n",
SQUASHFS_INODE_BLK(inode), offset,
inodep->start_block, inodep->offset);
break;
}
case SQUASHFS_SYMLINK_TYPE: {
struct squashfs_symlink_inode_header_2 *inodep =
&id.symlink;
struct squashfs_symlink_inode_header_2 *sinodep =
&sid.symlink;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
sinodep);
} else
if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
goto failed_read1;
i->i_size = inodep->symlink_size;
i->i_op = &page_symlink_inode_operations;
i->i_data.a_ops = &squashfs_symlink_aops;
i->i_mode |= S_IFLNK;
SQUASHFS_I(i)->start_block = next_block;
SQUASHFS_I(i)->offset = next_offset;
TRACE("Symbolic link inode %x:%x, start_block %llx, "
"offset %x\n",
SQUASHFS_INODE_BLK(inode), offset,
next_block, next_offset);
break;
}
case SQUASHFS_BLKDEV_TYPE:
case SQUASHFS_CHRDEV_TYPE: {
struct squashfs_dev_inode_header_2 *inodep = &id.dev;
struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
} else
if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
goto failed_read1;
i->i_mode |= (inodeb->inode_type ==
SQUASHFS_CHRDEV_TYPE) ? S_IFCHR :
S_IFBLK;
init_special_inode(i, i->i_mode, inodep->rdev);
TRACE("Device inode %x:%x, rdev %x\n",
SQUASHFS_INODE_BLK(inode), offset,
inodep->rdev);
break;
}
case SQUASHFS_FIFO_TYPE:
case SQUASHFS_SOCKET_TYPE: {
if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
goto failed_read1;
i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
? S_IFIFO : S_IFSOCK;
init_special_inode(i, i->i_mode, 0);
break;
}
default:
ERROR("Unknown inode type %d in squashfs_iget!\n",
inodeb->inode_type);
goto failed_read1;
}
insert_inode_hash(i);
return i;
failed_read:
ERROR("Unable to read inode [%x:%x]\n", block, offset);
failed_read1:
return NULL;
}
static int get_dir_index_using_offset(struct super_block *s, long long
*next_block, unsigned int *next_offset,
long long index_start,
unsigned int index_offset, int i_count,
long long f_pos)
{
struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
int i, length = 0;
struct squashfs_dir_index_2 index;
TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
i_count, (unsigned int) f_pos);
if (f_pos == 0)
goto finish;
for (i = 0; i < i_count; i++) {
if (msblk->swap) {
struct squashfs_dir_index_2 sindex;
squashfs_get_cached_block(s, (char *) &sindex,
index_start, index_offset,
sizeof(sindex), &index_start,
&index_offset);
SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
} else
squashfs_get_cached_block(s, (char *) &index,
index_start, index_offset,
sizeof(index), &index_start,
&index_offset);
if (index.index > f_pos)
break;
squashfs_get_cached_block(s, NULL, index_start, index_offset,
index.size + 1, &index_start,
&index_offset);
length = index.index;
*next_block = index.start_block + sblk->directory_table_start;
}
*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
finish:
return length;
}
static int get_dir_index_using_name(struct super_block *s, long long
*next_block, unsigned int *next_offset,
long long index_start,
unsigned int index_offset, int i_count,
const char *name, int size)
{
struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
int i, length = 0;
char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1];
struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer;
char str[SQUASHFS_NAME_LEN + 1];
TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
strncpy(str, name, size);
str[size] = '\0';
for (i = 0; i < i_count; i++) {
if (msblk->swap) {
struct squashfs_dir_index_2 sindex;
squashfs_get_cached_block(s, (char *) &sindex,
index_start, index_offset,
sizeof(sindex), &index_start,
&index_offset);
SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
} else
squashfs_get_cached_block(s, (char *) index,
index_start, index_offset,
sizeof(struct squashfs_dir_index_2),
&index_start, &index_offset);
squashfs_get_cached_block(s, index->name, index_start,
index_offset, index->size + 1,
&index_start, &index_offset);
index->name[index->size + 1] = '\0';
if (strcmp(index->name, str) > 0)
break;
length = index->index;
*next_block = index->start_block + sblk->directory_table_start;
}
*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
return length;
}
static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
{
struct inode *i = file->f_dentry->d_inode;
struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
long long next_block = SQUASHFS_I(i)->start_block +
sblk->directory_table_start;
int next_offset = SQUASHFS_I(i)->offset, length = 0,
dir_count;
struct squashfs_dir_header_2 dirh;
char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1];
struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
SQUASHFS_I(i)->u.s2.directory_index_start,
SQUASHFS_I(i)->u.s2.directory_index_offset,
SQUASHFS_I(i)->u.s2.directory_index_count,
file->f_pos);
while (length < i_size_read(i)) {
/* read directory header */
if (msblk->swap) {
struct squashfs_dir_header_2 sdirh;
if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
next_block, next_offset, sizeof(sdirh),
&next_block, &next_offset))
goto failed_read;
length += sizeof(sdirh);
SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
} else {
if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
next_block, next_offset, sizeof(dirh),
&next_block, &next_offset))
goto failed_read;
length += sizeof(dirh);
}
dir_count = dirh.count + 1;
while (dir_count--) {
if (msblk->swap) {
struct squashfs_dir_entry_2 sdire;
if (!squashfs_get_cached_block(i->i_sb, (char *)
&sdire, next_block, next_offset,
sizeof(sdire), &next_block,
&next_offset))
goto failed_read;
length += sizeof(sdire);
SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
} else {
if (!squashfs_get_cached_block(i->i_sb, (char *)
dire, next_block, next_offset,
sizeof(*dire), &next_block,
&next_offset))
goto failed_read;
length += sizeof(*dire);
}
if (!squashfs_get_cached_block(i->i_sb, dire->name,
next_block, next_offset,
dire->size + 1, &next_block,
&next_offset))
goto failed_read;
length += dire->size + 1;
if (file->f_pos >= length)
continue;
dire->name[dire->size + 1] = '\0';
TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
(unsigned int) dirent, dire->name,
dire->size + 1, (int) file->f_pos,
dirh.start_block, dire->offset,
squashfs_filetype_table[dire->type]);
if (filldir(dirent, dire->name, dire->size + 1,
file->f_pos, SQUASHFS_MK_VFS_INODE(
dirh.start_block, dire->offset),
squashfs_filetype_table[dire->type])
< 0) {
TRACE("Filldir returned less than 0\n");
goto finish;
}
file->f_pos = length;
}
}
finish:
return 0;
failed_read:
ERROR("Unable to read directory block [%llx:%x]\n", next_block,
next_offset);
return 0;
}
static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry)
{
const unsigned char *name = dentry->d_name.name;
int len = dentry->d_name.len;
struct inode *inode = NULL;
struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
struct squashfs_super_block *sblk = &msblk->sblk;
long long next_block = SQUASHFS_I(i)->start_block +
sblk->directory_table_start;
int next_offset = SQUASHFS_I(i)->offset, length = 0,
dir_count;
struct squashfs_dir_header_2 dirh;
char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN];
struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
if (len > SQUASHFS_NAME_LEN)
goto exit_loop;
length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
SQUASHFS_I(i)->u.s2.directory_index_start,
SQUASHFS_I(i)->u.s2.directory_index_offset,
SQUASHFS_I(i)->u.s2.directory_index_count, name,
len);
while (length < i_size_read(i)) {
/* read directory header */
if (msblk->swap) {
struct squashfs_dir_header_2 sdirh;
if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
next_block, next_offset, sizeof(sdirh),
&next_block, &next_offset))
goto failed_read;
length += sizeof(sdirh);
SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
} else {
if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
next_block, next_offset, sizeof(dirh),
&next_block, &next_offset))
goto failed_read;
length += sizeof(dirh);
}
dir_count = dirh.count + 1;
while (dir_count--) {
if (msblk->swap) {
struct squashfs_dir_entry_2 sdire;
if (!squashfs_get_cached_block(i->i_sb, (char *)
&sdire, next_block,next_offset,
sizeof(sdire), &next_block,
&next_offset))
goto failed_read;
length += sizeof(sdire);
SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
} else {
if (!squashfs_get_cached_block(i->i_sb, (char *)
dire, next_block,next_offset,
sizeof(*dire), &next_block,
&next_offset))
goto failed_read;
length += sizeof(*dire);
}
if (!squashfs_get_cached_block(i->i_sb, dire->name,
next_block, next_offset, dire->size + 1,
&next_block, &next_offset))
goto failed_read;
length += dire->size + 1;
if (sorted && name[0] < dire->name[0])
goto exit_loop;
if ((len == dire->size + 1) && !strncmp(name,
dire->name, len)) {
squashfs_inode_t ino =
SQUASHFS_MKINODE(dirh.start_block,
dire->offset);
TRACE("calling squashfs_iget for directory "
"entry %s, inode %x:%x, %d\n", name,
dirh.start_block, dire->offset, ino);
inode = (msblk->iget)(i->i_sb, ino);
goto exit_loop;
}
}
}
exit_loop:
d_add(dentry, inode);
return ERR_PTR(0);
failed_read:
ERROR("Unable to read directory block [%llx:%x]\n", next_block,
next_offset);
goto exit_loop;
}
int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
{
struct squashfs_super_block *sblk = &msblk->sblk;
msblk->iget = squashfs_iget_2;
msblk->read_fragment_index_table = read_fragment_index_table_2;
sblk->bytes_used = sblk->bytes_used_2;
sblk->uid_start = sblk->uid_start_2;
sblk->guid_start = sblk->guid_start_2;
sblk->inode_table_start = sblk->inode_table_start_2;
sblk->directory_table_start = sblk->directory_table_start_2;
sblk->fragment_table_start = sblk->fragment_table_start_2;
return 1;
}