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TOMOYO Linux Cross Reference
Linux/fs/befs/super.c

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  1 /*
  2  * super.c
  3  *
  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 fields
 18  * of the befs superblock
 19  */
 20 int
 21 befs_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 
 57 int
 58 befs_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 information
 93          * 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 a
104          * different way, non-fatal consistency check
105          */
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 

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