• Home
  • History
  • Annotate
  • Line#
  • Navigate
  • Raw
  • Download
  • only in /asuswrt-rt-n18u-9.0.0.4.380.2695/release/src-rt-6.x.4708/linux/linux-2.6.36/fs/efs/
1/*
2 * Copyright (c) 1999 Al Smith
3 *
4 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
5 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
6 */
7#ifndef _EFS_EFS_H_
8#define _EFS_EFS_H_
9
10#include <linux/fs.h>
11#include <asm/uaccess.h>
12
13#define EFS_VERSION "1.0a"
14
15static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>";
16
17
18/* 1 block is 512 bytes */
19#define	EFS_BLOCKSIZE_BITS	9
20#define	EFS_BLOCKSIZE		(1 << EFS_BLOCKSIZE_BITS)
21
22typedef	int32_t		efs_block_t;
23typedef uint32_t	efs_ino_t;
24
25#define	EFS_DIRECTEXTENTS	12
26
27/*
28 * layout of an extent, in memory and on disk. 8 bytes exactly.
29 */
30typedef union extent_u {
31	unsigned char raw[8];
32	struct extent_s {
33		unsigned int	ex_magic:8;	/* magic # (zero) */
34		unsigned int	ex_bn:24;	/* basic block */
35		unsigned int	ex_length:8;	/* numblocks in this extent */
36		unsigned int	ex_offset:24;	/* logical offset into file */
37	} cooked;
38} efs_extent;
39
40typedef struct edevs {
41	__be16		odev;
42	__be32		ndev;
43} efs_devs;
44
45/*
46 * extent based filesystem inode as it appears on disk.  The efs inode
47 * is exactly 128 bytes long.
48 */
49struct	efs_dinode {
50	__be16		di_mode;	/* mode and type of file */
51	__be16		di_nlink;	/* number of links to file */
52	__be16		di_uid;		/* owner's user id */
53	__be16		di_gid;		/* owner's group id */
54	__be32		di_size;	/* number of bytes in file */
55	__be32		di_atime;	/* time last accessed */
56	__be32		di_mtime;	/* time last modified */
57	__be32		di_ctime;	/* time created */
58	__be32		di_gen;		/* generation number */
59	__be16		di_numextents;	/* # of extents */
60	u_char		di_version;	/* version of inode */
61	u_char		di_spare;	/* spare - used by AFS */
62	union di_addr {
63		efs_extent	di_extents[EFS_DIRECTEXTENTS];
64		efs_devs	di_dev;	/* device for IFCHR/IFBLK */
65	} di_u;
66};
67
68/* efs inode storage in memory */
69struct efs_inode_info {
70	int		numextents;
71	int		lastextent;
72
73	efs_extent	extents[EFS_DIRECTEXTENTS];
74	struct inode	vfs_inode;
75};
76
77#include <linux/efs_fs_sb.h>
78
79#define EFS_DIRBSIZE_BITS	EFS_BLOCKSIZE_BITS
80#define EFS_DIRBSIZE		(1 << EFS_DIRBSIZE_BITS)
81
82struct efs_dentry {
83	__be32		inode;
84	unsigned char	namelen;
85	char		name[3];
86};
87
88#define EFS_DENTSIZE	(sizeof(struct efs_dentry) - 3 + 1)
89#define EFS_MAXNAMELEN  ((1 << (sizeof(char) * 8)) - 1)
90
91#define EFS_DIRBLK_HEADERSIZE	4
92#define EFS_DIRBLK_MAGIC	0xbeef	/* moo */
93
94struct efs_dir {
95	__be16	magic;
96	unsigned char	firstused;
97	unsigned char	slots;
98
99	unsigned char	space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
100};
101
102#define EFS_MAXENTS \
103	((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
104	 (EFS_DENTSIZE + sizeof(char)))
105
106#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
107
108#define EFS_REALOFF(offset) ((offset << 1))
109
110
111static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
112{
113	return container_of(inode, struct efs_inode_info, vfs_inode);
114}
115
116static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
117{
118	return sb->s_fs_info;
119}
120
121struct statfs;
122struct fid;
123
124extern const struct inode_operations efs_dir_inode_operations;
125extern const struct file_operations efs_dir_operations;
126extern const struct address_space_operations efs_symlink_aops;
127
128extern struct inode *efs_iget(struct super_block *, unsigned long);
129extern efs_block_t efs_map_block(struct inode *, efs_block_t);
130extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
131
132extern struct dentry *efs_lookup(struct inode *, struct dentry *, struct nameidata *);
133extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
134		int fh_len, int fh_type);
135extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
136		int fh_len, int fh_type);
137extern struct dentry *efs_get_parent(struct dentry *);
138extern int efs_bmap(struct inode *, int);
139
140#endif /* _EFS_EFS_H_ */
141