-
Notifications
You must be signed in to change notification settings - Fork 2
/
super.c
118 lines (97 loc) · 3.35 KB
/
super.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
/*
* super.c
*
* Copyright (C) 2001-2002 Will Dyson <[email protected]>
*
* Licensed under the GNU GPL. See the file COPYING for details.
*
*/
#include <linux/fs.h>
#include <asm/page.h> /* for PAGE_SIZE */
#include "befs.h"
#include "super.h"
/*
* befs_load_sb -- Read from disk and properly byteswap all the fields
* of the befs superblock
*/
int
befs_load_sb(struct super_block *sb, befs_super_block *disk_sb)
{
struct befs_sb_info *befs_sb = BEFS_SB(sb);
/* Check the byte order of the filesystem */
if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)
befs_sb->byte_order = BEFS_BYTESEX_LE;
else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)
befs_sb->byte_order = BEFS_BYTESEX_BE;
befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);
befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);
befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);
befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);
befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);
befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);
befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);
befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);
befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);
befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags);
befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
befs_sb->nls = NULL;
return BEFS_OK;
}
int
befs_check_sb(struct super_block *sb)
{
struct befs_sb_info *befs_sb = BEFS_SB(sb);
/* Check magic headers of super block */
if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
|| (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
|| (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
befs_error(sb, "invalid magic header");
return BEFS_ERR;
}
/*
* Check blocksize of BEFS.
*
* Blocksize of BEFS is 1024, 2048, 4096 or 8192.
*/
if ((befs_sb->block_size != 1024)
&& (befs_sb->block_size != 2048)
&& (befs_sb->block_size != 4096)
&& (befs_sb->block_size != 8192)) {
befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
return BEFS_ERR;
}
if (befs_sb->block_size > PAGE_SIZE) {
befs_error(sb, "blocksize(%u) cannot be larger "
"than system pagesize(%lu)", befs_sb->block_size,
PAGE_SIZE);
return BEFS_ERR;
}
/*
* block_shift and block_size encode the same information
* in different ways as a consistency check.
*/
if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
befs_error(sb, "block_shift disagrees with block_size. "
"Corruption likely.");
return BEFS_ERR;
}
/* ag_shift also encodes the same information as blocks_per_ag in a
* different way, non-fatal consistency check
*/
if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag)
befs_error(sb, "ag_shift disagrees with blocks_per_ag.");
if (befs_sb->log_start != befs_sb->log_end ||
befs_sb->flags == BEFS_DIRTY) {
befs_error(sb, "Filesystem not clean! There are blocks in the "
"journal. You must boot into BeOS and mount this "
"volume to make it clean.");
return BEFS_ERR;
}
return BEFS_OK;
}