root/fs/befs/super.c

DEFINITIONS

1. befs_load_sb
2. befs_check_sb

/*
 * 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;
}