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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 | * load_befs_sb -- Read from disk and properly byteswap all the fields |
18 | * of the befs superblock |
19 | * |
20 | * |
21 | * |
22 | * |
23 | */ |
24 | int |
25 | befs_load_sb(struct super_block *sb, befs_super_block * disk_sb) |
26 | { |
27 | befs_sb_info *befs_sb = BEFS_SB(sb); |
28 | |
29 | /* Check the byte order of the filesystem */ |
30 | if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE) |
31 | befs_sb->byte_order = BEFS_BYTESEX_LE; |
32 | else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE) |
33 | befs_sb->byte_order = BEFS_BYTESEX_BE; |
34 | |
35 | befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1); |
36 | befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2); |
37 | befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3); |
38 | befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size); |
39 | befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift); |
40 | befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks); |
41 | befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks); |
42 | befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size); |
43 | |
44 | befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag); |
45 | befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift); |
46 | befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags); |
47 | |
48 | befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks); |
49 | befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start); |
50 | befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end); |
51 | |
52 | befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir); |
53 | befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices); |
54 | befs_sb->nls = NULL; |
55 | |
56 | return BEFS_OK; |
57 | } |
58 | |
59 | int |
60 | befs_check_sb(struct super_block *sb) |
61 | { |
62 | befs_sb_info *befs_sb = BEFS_SB(sb); |
63 | |
64 | /* Check magic headers of super block */ |
65 | if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1) |
66 | || (befs_sb->magic2 != BEFS_SUPER_MAGIC2) |
67 | || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) { |
68 | befs_error(sb, "invalid magic header"); |
69 | return BEFS_ERR; |
70 | } |
71 | |
72 | /* |
73 | * Check blocksize of BEFS. |
74 | * |
75 | * Blocksize of BEFS is 1024, 2048, 4096 or 8192. |
76 | */ |
77 | |
78 | if ((befs_sb->block_size != 1024) |
79 | && (befs_sb->block_size != 2048) |
80 | && (befs_sb->block_size != 4096) |
81 | && (befs_sb->block_size != 8192)) { |
82 | befs_error(sb, "invalid blocksize: %u", befs_sb->block_size); |
83 | return BEFS_ERR; |
84 | } |
85 | |
86 | if (befs_sb->block_size > PAGE_SIZE) { |
87 | befs_error(sb, "blocksize(%u) cannot be larger" |
88 | "than system pagesize(%lu)", befs_sb->block_size, |
89 | PAGE_SIZE); |
90 | return BEFS_ERR; |
91 | } |
92 | |
93 | /* |
94 | * block_shift and block_size encode the same information |
95 | * in different ways as a consistency check. |
96 | */ |
97 | |
98 | if ((1 << befs_sb->block_shift) != befs_sb->block_size) { |
99 | befs_error(sb, "block_shift disagrees with block_size. " |
100 | "Corruption likely."); |
101 | return BEFS_ERR; |
102 | } |
103 | |
104 | if (befs_sb->log_start != befs_sb->log_end) { |
105 | befs_error(sb, "Filesystem not clean! There are blocks in the " |
106 | "journal. You must boot into BeOS and mount this volume " |
107 | "to make it clean."); |
108 | return BEFS_ERR; |
109 | } |
110 | |
111 | return BEFS_OK; |
112 | } |
113 |
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