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