112 lines
3 KiB
C
112 lines
3 KiB
C
|
/*
|
||
|
|
* super.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com>
|
||
|
|
*
|
||
|
|
* Licensed under the GNU GPL. See the file COPYING for details.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/fs.h>
|
||
|
|
|
||
|
|
#include "befs.h"
|
||
|
|
#include "super.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* load_befs_sb -- Read from disk and properly byteswap all the fields
|
||
|
|
* of the befs superblock
|
||
|
|
*
|
||
|
|
*
|
||
|
|
*
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
befs_load_sb(struct super_block *sb, befs_super_block * disk_sb)
|
||
|
|
{
|
||
|
|
befs_sb_info *befs_sb = BEFS_SB(sb);
|
||
|
|
|
||
|
|
/* Check the byte order of the filesystem */
|
||
|
|
if (le32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
|
||
|
|
befs_sb->byte_order = BEFS_BYTESEX_LE;
|
||
|
|
else if (be32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
|
||
|
|
befs_sb->byte_order = BEFS_BYTESEX_BE;
|
||
|
|
|
||
|
|
befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
|
||
|
|
befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);
|
||
|
|
befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);
|
||
|
|
befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);
|
||
|
|
befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);
|
||
|
|
befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);
|
||
|
|
befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);
|
||
|
|
befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);
|
||
|
|
|
||
|
|
befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);
|
||
|
|
befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
|
||
|
|
befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);
|
||
|
|
|
||
|
|
befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
|
||
|
|
befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
|
||
|
|
befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
|
||
|
|
|
||
|
|
befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
|
||
|
|
befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
|
||
|
|
befs_sb->nls = NULL;
|
||
|
|
|
||
|
|
return BEFS_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
befs_check_sb(struct super_block *sb)
|
||
|
|
{
|
||
|
|
befs_sb_info *befs_sb = BEFS_SB(sb);
|
||
|
|
|
||
|
|
/* Check magic headers of super block */
|
||
|
|
if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
|
||
|
|
|| (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
|
||
|
|
|| (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
|
||
|
|
befs_error(sb, "invalid magic header");
|
||
|
|
return BEFS_ERR;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Check blocksize of BEFS.
|
||
|
|
*
|
||
|
|
* Blocksize of BEFS is 1024, 2048, 4096 or 8192.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if ((befs_sb->block_size != 1024)
|
||
|
|
&& (befs_sb->block_size != 2048)
|
||
|
|
&& (befs_sb->block_size != 4096)
|
||
|
|
&& (befs_sb->block_size != 8192)) {
|
||
|
|
befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
|
||
|
|
return BEFS_ERR;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (befs_sb->block_size > PAGE_SIZE) {
|
||
|
|
befs_error(sb, "blocksize(%u) cannot be larger"
|
||
|
|
"than system pagesize(%lu)", befs_sb->block_size,
|
||
|
|
PAGE_SIZE);
|
||
|
|
return BEFS_ERR;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* block_shift and block_size encode the same information
|
||
|
|
* in different ways as a consistency check.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
|
||
|
|
befs_error(sb, "block_shift disagrees with block_size. "
|
||
|
|
"Corruption likely.");
|
||
|
|
return BEFS_ERR;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (befs_sb->log_start != befs_sb->log_end) {
|
||
|
|
befs_error(sb, "Filesystem not clean! There are blocks in the "
|
||
|
|
"journal. You must boot into BeOS and mount this volume "
|
||
|
|
"to make it clean.");
|
||
|
|
return BEFS_ERR;
|
||
|
|
}
|
||
|
|
|
||
|
|
return BEFS_OK;
|
||
|
|
}
|