11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * super.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com> 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Licensed under the GNU GPL. See the file COPYING for details. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/fs.h> 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include "befs.h" 131da177e4SLinus Torvalds #include "super.h" 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds /** 161da177e4SLinus Torvalds * load_befs_sb -- Read from disk and properly byteswap all the fields 171da177e4SLinus Torvalds * of the befs superblock 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds */ 231da177e4SLinus Torvalds int 241da177e4SLinus Torvalds befs_load_sb(struct super_block *sb, befs_super_block * disk_sb) 251da177e4SLinus Torvalds { 261da177e4SLinus Torvalds befs_sb_info *befs_sb = BEFS_SB(sb); 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds /* Check the byte order of the filesystem */ 29*152b95a1SHarvey Harrison if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE) 301da177e4SLinus Torvalds befs_sb->byte_order = BEFS_BYTESEX_LE; 31*152b95a1SHarvey Harrison else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE) 321da177e4SLinus Torvalds befs_sb->byte_order = BEFS_BYTESEX_BE; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1); 351da177e4SLinus Torvalds befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2); 361da177e4SLinus Torvalds befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3); 371da177e4SLinus Torvalds befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size); 381da177e4SLinus Torvalds befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift); 391da177e4SLinus Torvalds befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks); 401da177e4SLinus Torvalds befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks); 411da177e4SLinus Torvalds befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size); 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag); 441da177e4SLinus Torvalds befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift); 451da177e4SLinus Torvalds befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags); 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks); 481da177e4SLinus Torvalds befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start); 491da177e4SLinus Torvalds befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir); 521da177e4SLinus Torvalds befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices); 531da177e4SLinus Torvalds befs_sb->nls = NULL; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds return BEFS_OK; 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds int 591da177e4SLinus Torvalds befs_check_sb(struct super_block *sb) 601da177e4SLinus Torvalds { 611da177e4SLinus Torvalds befs_sb_info *befs_sb = BEFS_SB(sb); 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* Check magic headers of super block */ 641da177e4SLinus Torvalds if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1) 651da177e4SLinus Torvalds || (befs_sb->magic2 != BEFS_SUPER_MAGIC2) 661da177e4SLinus Torvalds || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) { 671da177e4SLinus Torvalds befs_error(sb, "invalid magic header"); 681da177e4SLinus Torvalds return BEFS_ERR; 691da177e4SLinus Torvalds } 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * Check blocksize of BEFS. 731da177e4SLinus Torvalds * 741da177e4SLinus Torvalds * Blocksize of BEFS is 1024, 2048, 4096 or 8192. 751da177e4SLinus Torvalds */ 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds if ((befs_sb->block_size != 1024) 781da177e4SLinus Torvalds && (befs_sb->block_size != 2048) 791da177e4SLinus Torvalds && (befs_sb->block_size != 4096) 801da177e4SLinus Torvalds && (befs_sb->block_size != 8192)) { 811da177e4SLinus Torvalds befs_error(sb, "invalid blocksize: %u", befs_sb->block_size); 821da177e4SLinus Torvalds return BEFS_ERR; 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds if (befs_sb->block_size > PAGE_SIZE) { 861da177e4SLinus Torvalds befs_error(sb, "blocksize(%u) cannot be larger" 871da177e4SLinus Torvalds "than system pagesize(%lu)", befs_sb->block_size, 881da177e4SLinus Torvalds PAGE_SIZE); 891da177e4SLinus Torvalds return BEFS_ERR; 901da177e4SLinus Torvalds } 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* 931da177e4SLinus Torvalds * block_shift and block_size encode the same information 941da177e4SLinus Torvalds * in different ways as a consistency check. 951da177e4SLinus Torvalds */ 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds if ((1 << befs_sb->block_shift) != befs_sb->block_size) { 981da177e4SLinus Torvalds befs_error(sb, "block_shift disagrees with block_size. " 991da177e4SLinus Torvalds "Corruption likely."); 1001da177e4SLinus Torvalds return BEFS_ERR; 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds if (befs_sb->log_start != befs_sb->log_end) { 1041da177e4SLinus Torvalds befs_error(sb, "Filesystem not clean! There are blocks in the " 1051da177e4SLinus Torvalds "journal. You must boot into BeOS and mount this volume " 1061da177e4SLinus Torvalds "to make it clean."); 1071da177e4SLinus Torvalds return BEFS_ERR; 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds return BEFS_OK; 1111da177e4SLinus Torvalds } 112