/* * 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" #include "endian.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; }