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 1611674239SLuis de Bethencourt /* 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 int 211da177e4SLinus Torvalds befs_load_sb(struct super_block *sb, befs_super_block *disk_sb) 221da177e4SLinus Torvalds { 23038428fcSFabian Frederick struct befs_sb_info *befs_sb = BEFS_SB(sb); 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* Check the byte order of the filesystem */ 26152b95a1SHarvey Harrison if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE) 271da177e4SLinus Torvalds befs_sb->byte_order = BEFS_BYTESEX_LE; 28152b95a1SHarvey Harrison else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE) 291da177e4SLinus Torvalds befs_sb->byte_order = BEFS_BYTESEX_BE; 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1); 321da177e4SLinus Torvalds befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2); 331da177e4SLinus Torvalds befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3); 341da177e4SLinus Torvalds befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size); 351da177e4SLinus Torvalds befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift); 361da177e4SLinus Torvalds befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks); 371da177e4SLinus Torvalds befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks); 381da177e4SLinus Torvalds befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag); 411da177e4SLinus Torvalds befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift); 421da177e4SLinus Torvalds befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags); 431da177e4SLinus Torvalds 446ea4558fSSalah Triki befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags); 456ea4558fSSalah Triki 461da177e4SLinus Torvalds befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks); 471da177e4SLinus Torvalds befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start); 481da177e4SLinus Torvalds befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end); 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir); 511da177e4SLinus Torvalds befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices); 521da177e4SLinus Torvalds befs_sb->nls = NULL; 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds return BEFS_OK; 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds int 581da177e4SLinus Torvalds befs_check_sb(struct super_block *sb) 591da177e4SLinus Torvalds { 60038428fcSFabian Frederick struct befs_sb_info *befs_sb = BEFS_SB(sb); 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds /* Check magic headers of super block */ 631da177e4SLinus Torvalds if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1) 641da177e4SLinus Torvalds || (befs_sb->magic2 != BEFS_SUPER_MAGIC2) 651da177e4SLinus Torvalds || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) { 661da177e4SLinus Torvalds befs_error(sb, "invalid magic header"); 671da177e4SLinus Torvalds return BEFS_ERR; 681da177e4SLinus Torvalds } 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds /* 711da177e4SLinus Torvalds * Check blocksize of BEFS. 721da177e4SLinus Torvalds * 731da177e4SLinus Torvalds * Blocksize of BEFS is 1024, 2048, 4096 or 8192. 741da177e4SLinus Torvalds */ 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds if ((befs_sb->block_size != 1024) 771da177e4SLinus Torvalds && (befs_sb->block_size != 2048) 781da177e4SLinus Torvalds && (befs_sb->block_size != 4096) 791da177e4SLinus Torvalds && (befs_sb->block_size != 8192)) { 801da177e4SLinus Torvalds befs_error(sb, "invalid blocksize: %u", befs_sb->block_size); 811da177e4SLinus Torvalds return BEFS_ERR; 821da177e4SLinus Torvalds } 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds if (befs_sb->block_size > PAGE_SIZE) { 851da177e4SLinus Torvalds befs_error(sb, "blocksize(%u) cannot be larger " 861da177e4SLinus Torvalds "than system pagesize(%lu)", befs_sb->block_size, 871da177e4SLinus Torvalds PAGE_SIZE); 881da177e4SLinus Torvalds return BEFS_ERR; 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* 921da177e4SLinus Torvalds * block_shift and block_size encode the same information 931da177e4SLinus Torvalds * in different ways as a consistency check. 941da177e4SLinus Torvalds */ 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds if ((1 << befs_sb->block_shift) != befs_sb->block_size) { 971da177e4SLinus Torvalds befs_error(sb, "block_shift disagrees with block_size. " 981da177e4SLinus Torvalds "Corruption likely."); 991da177e4SLinus Torvalds return BEFS_ERR; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 102bbe1bd0bSLuis de Bethencourt 103bbe1bd0bSLuis de Bethencourt /* ag_shift also encodes the same information as blocks_per_ag in a 104bbe1bd0bSLuis de Bethencourt * different way, non-fatal consistency check 105bbe1bd0bSLuis de Bethencourt */ 106bbe1bd0bSLuis de Bethencourt if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag) 107bbe1bd0bSLuis de Bethencourt befs_error(sb, "ag_shift disagrees with blocks_per_ag."); 108bbe1bd0bSLuis de Bethencourt 109*103c0fb3SLuis de Bethencourt if (befs_sb->log_start != befs_sb->log_end || 110*103c0fb3SLuis de Bethencourt befs_sb->flags == BEFS_DIRTY) { 1111da177e4SLinus Torvalds befs_error(sb, "Filesystem not clean! There are blocks in the " 112*103c0fb3SLuis de Bethencourt "journal. You must boot into BeOS and mount this " 113*103c0fb3SLuis de Bethencourt "volume to make it clean."); 1141da177e4SLinus Torvalds return BEFS_ERR; 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds return BEFS_OK; 1181da177e4SLinus Torvalds } 119