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
12#include "befs_fs.h"
13#include "endian.h"
14
15/**
16 * load_befs_sb -- Read from disk and properly byteswap all the fields
17 * of the befs superblock
18 *
19 *
20 *
21 *
22 */
23int
24befs_load_sb(struct super_block *sb, befs_super_block * disk_sb)
25{
26	befs_sb_info *befs_sb = BEFS_SB(sb);
27
28	/* byte_order is special, no byte-swap */
29	befs_sb->byte_order = disk_sb->fs_byte_order;
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->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
45	befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
46	befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
47
48	befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
49	befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
50	befs_sb->nls = NULL;
51
52	return BEFS_OK;
53}
54
55int
56befs_check_sb(struct super_block *sb)
57{
58	befs_sb_info *befs_sb = BEFS_SB(sb);
59
60	/* Check magic headers of super block */
61	if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
62	    || (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
63	    || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
64		befs_error(sb, "invalid magic header");
65		return BEFS_ERR;
66	}
67
68	/*
69	 * Check blocksize of BEFS.
70	 *
71	 * Blocksize of BEFS is 1024, 2048, 4096 or 8192.
72	 */
73
74	if ((befs_sb->block_size != 1024)
75	    && (befs_sb->block_size != 2048)
76	    && (befs_sb->block_size != 4096)
77	    && (befs_sb->block_size != 8192)) {
78		befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
79		return BEFS_ERR;
80	}
81
82	if (befs_sb->block_size > PAGE_SIZE) {
83		befs_error(sb, "blocksize(%u) cannot be larger"
84			   "than system pagesize(%lu)", befs_sb->block_size,
85			   PAGE_SIZE);
86		return BEFS_ERR;
87	}
88
89	/*
90	   * block_shift and block_size encode the same information
91	   * in different ways as a consistency check.
92	 */
93
94	if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
95		befs_error(sb, "block_shift disagrees with block_size. "
96			   "Corruption likely.");
97		return BEFS_ERR;
98	}
99
100	if (befs_sb->log_start != befs_sb->log_end) {
101		befs_error(sb, "Filesystem not clean! There are blocks in the "
102			   "journal. You must boot into BeOS and mount this volume "
103			   "to make it clean.");
104		return BEFS_ERR;
105	}
106
107	return BEFS_OK;
108}
109