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1/*2 * super.c3 *4 * Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com>5 *6 * Licensed under the GNU GPL. See the file COPYING for details.7 *8 */9 10#include <linux/fs.h>11#include <asm/page.h> /* for PAGE_SIZE */12 13#include "befs.h"14#include "super.h"15 16/*17 * befs_load_sb -- Read from disk and properly byteswap all the fields18 * of the befs superblock19 */20int21befs_load_sb(struct super_block *sb, befs_super_block *disk_sb)22{23 struct befs_sb_info *befs_sb = BEFS_SB(sb);24 25 /* Check the byte order of the filesystem */26 if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)27 befs_sb->byte_order = BEFS_BYTESEX_LE;28 else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)29 befs_sb->byte_order = BEFS_BYTESEX_BE;30 31 befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);32 befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);33 befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);34 befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);35 befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);36 befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);37 befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);38 befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);39 40 befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);41 befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);42 befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);43 44 befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags);45 46 befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);47 befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);48 befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);49 50 befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);51 befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);52 befs_sb->nls = NULL;53 54 return BEFS_OK;55}56 57int58befs_check_sb(struct super_block *sb)59{60 struct befs_sb_info *befs_sb = BEFS_SB(sb);61 62 /* Check magic headers of super block */63 if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)64 || (befs_sb->magic2 != BEFS_SUPER_MAGIC2)65 || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {66 befs_error(sb, "invalid magic header");67 return BEFS_ERR;68 }69 70 /*71 * Check blocksize of BEFS.72 *73 * Blocksize of BEFS is 1024, 2048, 4096 or 8192.74 */75 76 if ((befs_sb->block_size != 1024)77 && (befs_sb->block_size != 2048)78 && (befs_sb->block_size != 4096)79 && (befs_sb->block_size != 8192)) {80 befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);81 return BEFS_ERR;82 }83 84 if (befs_sb->block_size > PAGE_SIZE) {85 befs_error(sb, "blocksize(%u) cannot be larger "86 "than system pagesize(%lu)", befs_sb->block_size,87 PAGE_SIZE);88 return BEFS_ERR;89 }90 91 /*92 * block_shift and block_size encode the same information93 * in different ways as a consistency check.94 */95 96 if ((1 << befs_sb->block_shift) != befs_sb->block_size) {97 befs_error(sb, "block_shift disagrees with block_size. "98 "Corruption likely.");99 return BEFS_ERR;100 }101 102 103 /* ag_shift also encodes the same information as blocks_per_ag in a104 * different way, non-fatal consistency check105 */106 if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag)107 befs_error(sb, "ag_shift disagrees with blocks_per_ag.");108 109 if (befs_sb->log_start != befs_sb->log_end ||110 befs_sb->flags == BEFS_DIRTY) {111 befs_error(sb, "Filesystem not clean! There are blocks in the "112 "journal. You must boot into BeOS and mount this "113 "volume to make it clean.");114 return BEFS_ERR;115 }116 117 return BEFS_OK;118}119