1 /*
2  * befs.h
3  *
4  * Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com>
5  * Copyright (C) 1999 Makoto Kato (m_kato@ga2.so-net.ne.jp)
6  */
7 
8 #ifndef _LINUX_BEFS_H
9 #define _LINUX_BEFS_H
10 
11 #include "befs_fs_types.h"
12 
13 /* used in debug.c */
14 #define BEFS_VERSION "0.9.3"
15 
16 
17 typedef u64 befs_blocknr_t;
18 /*
19  * BeFS in memory structures
20  */
21 
22 typedef struct befs_mount_options {
23 	gid_t gid;
24 	uid_t uid;
25 	int use_gid;
26 	int use_uid;
27 	int debug;
28 	char *iocharset;
29 } befs_mount_options;
30 
31 typedef struct befs_sb_info {
32 	u32 magic1;
33 	u32 block_size;
34 	u32 block_shift;
35 	int byte_order;
36 	befs_off_t num_blocks;
37 	befs_off_t used_blocks;
38 	u32 inode_size;
39 	u32 magic2;
40 
41 	/* Allocation group information */
42 	u32 blocks_per_ag;
43 	u32 ag_shift;
44 	u32 num_ags;
45 
46 	/* jornal log entry */
47 	befs_block_run log_blocks;
48 	befs_off_t log_start;
49 	befs_off_t log_end;
50 
51 	befs_inode_addr root_dir;
52 	befs_inode_addr indices;
53 	u32 magic3;
54 
55 	befs_mount_options mount_opts;
56 	struct nls_table *nls;
57 
58 } befs_sb_info;
59 
60 typedef struct befs_inode_info {
61 	u32 i_flags;
62 	u32 i_type;
63 
64 	befs_inode_addr i_inode_num;
65 	befs_inode_addr i_parent;
66 	befs_inode_addr i_attribute;
67 
68 	union {
69 		befs_data_stream ds;
70 		char symlink[BEFS_SYMLINK_LEN];
71 	} i_data;
72 
73 	struct inode vfs_inode;
74 
75 } befs_inode_info;
76 
77 enum befs_err {
78 	BEFS_OK,
79 	BEFS_ERR,
80 	BEFS_BAD_INODE,
81 	BEFS_BT_END,
82 	BEFS_BT_EMPTY,
83 	BEFS_BT_MATCH,
84 	BEFS_BT_PARMATCH,
85 	BEFS_BT_NOT_FOUND
86 };
87 
88 
89 /****************************/
90 /* debug.c */
91 void befs_error(const struct super_block *sb, const char *fmt, ...);
92 void befs_warning(const struct super_block *sb, const char *fmt, ...);
93 void befs_debug(const struct super_block *sb, const char *fmt, ...);
94 
95 void befs_dump_super_block(const struct super_block *sb, befs_super_block *);
96 void befs_dump_inode(const struct super_block *sb, befs_inode *);
97 void befs_dump_index_entry(const struct super_block *sb, befs_disk_btree_super *);
98 void befs_dump_index_node(const struct super_block *sb, befs_btree_nodehead *);
99 /****************************/
100 
101 
102 /* Gets a pointer to the private portion of the super_block
103  * structure from the public part
104  */
105 static inline befs_sb_info *
BEFS_SB(const struct super_block * super)106 BEFS_SB(const struct super_block *super)
107 {
108 	return (befs_sb_info *) super->s_fs_info;
109 }
110 
111 static inline befs_inode_info *
BEFS_I(const struct inode * inode)112 BEFS_I(const struct inode *inode)
113 {
114 	return list_entry(inode, struct befs_inode_info, vfs_inode);
115 }
116 
117 static inline befs_blocknr_t
iaddr2blockno(struct super_block * sb,befs_inode_addr * iaddr)118 iaddr2blockno(struct super_block *sb, befs_inode_addr * iaddr)
119 {
120 	return ((iaddr->allocation_group << BEFS_SB(sb)->ag_shift) +
121 		iaddr->start);
122 }
123 
124 static inline befs_inode_addr
blockno2iaddr(struct super_block * sb,befs_blocknr_t blockno)125 blockno2iaddr(struct super_block *sb, befs_blocknr_t blockno)
126 {
127 	befs_inode_addr iaddr;
128 	iaddr.allocation_group = blockno >> BEFS_SB(sb)->ag_shift;
129 	iaddr.start =
130 	    blockno - (iaddr.allocation_group << BEFS_SB(sb)->ag_shift);
131 	iaddr.len = 1;
132 
133 	return iaddr;
134 }
135 
136 static inline unsigned int
befs_iaddrs_per_block(struct super_block * sb)137 befs_iaddrs_per_block(struct super_block *sb)
138 {
139 	return BEFS_SB(sb)->block_size / sizeof (befs_disk_inode_addr);
140 }
141 
142 static inline int
befs_iaddr_is_empty(befs_inode_addr * iaddr)143 befs_iaddr_is_empty(befs_inode_addr * iaddr)
144 {
145 	return (!iaddr->allocation_group) && (!iaddr->start) && (!iaddr->len);
146 }
147 
148 static inline size_t
befs_brun_size(struct super_block * sb,befs_block_run run)149 befs_brun_size(struct super_block *sb, befs_block_run run)
150 {
151 	return BEFS_SB(sb)->block_size * run.len;
152 }
153 
154 #include "endian.h"
155 
156 #endif				/* _LINUX_BEFS_H */
157