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> 112b3fffefSAlexander Beregalov #include <asm/page.h> /* for PAGE_SIZE */ 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds #include "befs.h" 141da177e4SLinus Torvalds #include "super.h" 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds /** 1710145d61SLuis de Bethencourt * befs_load_sb -- Read from disk and properly byteswap all the fields 181da177e4SLinus Torvalds * of the befs superblock 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds */ 241da177e4SLinus Torvalds int 251da177e4SLinus Torvalds befs_load_sb(struct super_block *sb, befs_super_block * disk_sb) 261da177e4SLinus Torvalds { 27038428fcSFabian Frederick struct befs_sb_info *befs_sb = BEFS_SB(sb); 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* Check the byte order of the filesystem */ 30152b95a1SHarvey Harrison if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE) 311da177e4SLinus Torvalds befs_sb->byte_order = BEFS_BYTESEX_LE; 32152b95a1SHarvey Harrison else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE) 331da177e4SLinus Torvalds befs_sb->byte_order = BEFS_BYTESEX_BE; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1); 361da177e4SLinus Torvalds befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2); 371da177e4SLinus Torvalds befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3); 381da177e4SLinus Torvalds befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size); 391da177e4SLinus Torvalds befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift); 401da177e4SLinus Torvalds befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks); 411da177e4SLinus Torvalds befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks); 421da177e4SLinus Torvalds befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag); 451da177e4SLinus Torvalds befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift); 461da177e4SLinus Torvalds befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags); 471da177e4SLinus Torvalds 48*6ea4558fSSalah Triki befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags); 49*6ea4558fSSalah Triki 501da177e4SLinus Torvalds befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks); 511da177e4SLinus Torvalds befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start); 521da177e4SLinus Torvalds befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir); 551da177e4SLinus Torvalds befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices); 561da177e4SLinus Torvalds befs_sb->nls = NULL; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds return BEFS_OK; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds int 621da177e4SLinus Torvalds befs_check_sb(struct super_block *sb) 631da177e4SLinus Torvalds { 64038428fcSFabian Frederick struct befs_sb_info *befs_sb = BEFS_SB(sb); 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds /* Check magic headers of super block */ 671da177e4SLinus Torvalds if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1) 681da177e4SLinus Torvalds || (befs_sb->magic2 != BEFS_SUPER_MAGIC2) 691da177e4SLinus Torvalds || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) { 701da177e4SLinus Torvalds befs_error(sb, "invalid magic header"); 711da177e4SLinus Torvalds return BEFS_ERR; 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds /* 751da177e4SLinus Torvalds * Check blocksize of BEFS. 761da177e4SLinus Torvalds * 771da177e4SLinus Torvalds * Blocksize of BEFS is 1024, 2048, 4096 or 8192. 781da177e4SLinus Torvalds */ 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds if ((befs_sb->block_size != 1024) 811da177e4SLinus Torvalds && (befs_sb->block_size != 2048) 821da177e4SLinus Torvalds && (befs_sb->block_size != 4096) 831da177e4SLinus Torvalds && (befs_sb->block_size != 8192)) { 841da177e4SLinus Torvalds befs_error(sb, "invalid blocksize: %u", befs_sb->block_size); 851da177e4SLinus Torvalds return BEFS_ERR; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds if (befs_sb->block_size > PAGE_SIZE) { 891da177e4SLinus Torvalds befs_error(sb, "blocksize(%u) cannot be larger" 901da177e4SLinus Torvalds "than system pagesize(%lu)", befs_sb->block_size, 911da177e4SLinus Torvalds PAGE_SIZE); 921da177e4SLinus Torvalds return BEFS_ERR; 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* 961da177e4SLinus Torvalds * block_shift and block_size encode the same information 971da177e4SLinus Torvalds * in different ways as a consistency check. 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds if ((1 << befs_sb->block_shift) != befs_sb->block_size) { 1011da177e4SLinus Torvalds befs_error(sb, "block_shift disagrees with block_size. " 1021da177e4SLinus Torvalds "Corruption likely."); 1031da177e4SLinus Torvalds return BEFS_ERR; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds 106*6ea4558fSSalah Triki if (befs_sb->log_start != befs_sb->log_end || befs_sb->flags == BEFS_DIRTY) { 1071da177e4SLinus Torvalds befs_error(sb, "Filesystem not clean! There are blocks in the " 1081da177e4SLinus Torvalds "journal. You must boot into BeOS and mount this volume " 1091da177e4SLinus Torvalds "to make it clean."); 1101da177e4SLinus Torvalds return BEFS_ERR; 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds return BEFS_OK; 1141da177e4SLinus Torvalds } 115