[linux.git] / fs / efs / efs.h

/*
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
 */
#ifndef _EFS_EFS_H_
#define _EFS_EFS_H_

#include <linux/fs.h>
#include <asm/uaccess.h>

#define EFS_VERSION "1.0a"

static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <[email protected]>";


/* 1 block is 512 bytes */
#define	EFS_BLOCKSIZE_BITS	9
#define	EFS_BLOCKSIZE		(1 << EFS_BLOCKSIZE_BITS)

typedef	int32_t		efs_block_t;
typedef uint32_t	efs_ino_t;

#define	EFS_DIRECTEXTENTS	12

/*
 * layout of an extent, in memory and on disk. 8 bytes exactly.
 */
typedef union extent_u {
	unsigned char raw[8];
	struct extent_s {
		unsigned int	ex_magic:8;	/* magic # (zero) */
		unsigned int	ex_bn:24;	/* basic block */
		unsigned int	ex_length:8;	/* numblocks in this extent */
		unsigned int	ex_offset:24;	/* logical offset into file */
	} cooked;
} efs_extent;

typedef struct edevs {
	__be16		odev;
	__be32		ndev;
} efs_devs;

/*
 * extent based filesystem inode as it appears on disk.  The efs inode
 * is exactly 128 bytes long.
 */
struct	efs_dinode {
	__be16		di_mode;	/* mode and type of file */
	__be16		di_nlink;	/* number of links to file */
	__be16		di_uid;		/* owner's user id */
	__be16		di_gid;		/* owner's group id */
	__be32		di_size;	/* number of bytes in file */
	__be32		di_atime;	/* time last accessed */
	__be32		di_mtime;	/* time last modified */
	__be32		di_ctime;	/* time created */
	__be32		di_gen;		/* generation number */
	__be16		di_numextents;	/* # of extents */
	u_char		di_version;	/* version of inode */
	u_char		di_spare;	/* spare - used by AFS */
	union di_addr {
		efs_extent	di_extents[EFS_DIRECTEXTENTS];
		efs_devs	di_dev;	/* device for IFCHR/IFBLK */
	} di_u;
};

/* efs inode storage in memory */
struct efs_inode_info {
	int		numextents;
	int		lastextent;

	efs_extent	extents[EFS_DIRECTEXTENTS];
	struct inode	vfs_inode;
};

#include <linux/efs_fs_sb.h>

#define EFS_DIRBSIZE_BITS	EFS_BLOCKSIZE_BITS
#define EFS_DIRBSIZE		(1 << EFS_DIRBSIZE_BITS)

struct efs_dentry {
	__be32		inode;
	unsigned char	namelen;
	char		name[3];
};

#define EFS_DENTSIZE	(sizeof(struct efs_dentry) - 3 + 1)
#define EFS_MAXNAMELEN  ((1 << (sizeof(char) * 8)) - 1)

#define EFS_DIRBLK_HEADERSIZE	4
#define EFS_DIRBLK_MAGIC	0xbeef	/* moo */

struct efs_dir {
	__be16	magic;
	unsigned char	firstused;
	unsigned char	slots;

	unsigned char	space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
};

#define EFS_MAXENTS \
	((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
	 (EFS_DENTSIZE + sizeof(char)))

#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])

#define EFS_REALOFF(offset) ((offset << 1))


static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
{
	return container_of(inode, struct efs_inode_info, vfs_inode);
}

static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
{
	return sb->s_fs_info;
}

struct statfs;
struct fid;

extern const struct inode_operations efs_dir_inode_operations;
extern const struct file_operations efs_dir_operations;
extern const struct address_space_operations efs_symlink_aops;

extern struct inode *efs_iget(struct super_block *, unsigned long);
extern efs_block_t efs_map_block(struct inode *, efs_block_t);
extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);

extern struct dentry *efs_lookup(struct inode *, struct dentry *, struct nameidata *);
extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type);
extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type);
extern struct dentry *efs_get_parent(struct dentry *);
extern int efs_bmap(struct inode *, int);

#endif /* _EFS_EFS_H_ */
Commit	Line	Data
45254b4f CH	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
	15	static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <[email protected]>";
	16
	17
	18	/* 1 block is 512 bytes */
	19	#define EFS_BLOCKSIZE_BITS 9
	20	#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
	21
	22	typedef int32_t efs_block_t;
	23	typedef 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	*/
	30	typedef 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
	40	typedef 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	*/
	49	struct 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 */
69	struct 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
82	struct 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
94	struct 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
111	static inline struct efs_inode_info INODE_INFO(struct inode inode)
112	{
113	return container_of(inode, struct efs_inode_info, vfs_inode);
114	}
115
116	static inline struct efs_sb_info SUPER_INFO(struct super_block sb)
117	{
118	return sb->s_fs_info;
119	}
120
121	struct statfs;
122	struct fid;
123
124	extern const struct inode_operations efs_dir_inode_operations;
125	extern const struct file_operations efs_dir_operations;
126	extern const struct address_space_operations efs_symlink_aops;
127
128	extern struct inode efs_iget(struct super_block , unsigned long);
129	extern efs_block_t efs_map_block(struct inode *, efs_block_t);
130	extern int efs_get_block(struct inode , sector_t, struct buffer_head , int);
131
132	extern struct dentry efs_lookup(struct inode , struct dentry , struct nameidata );
133	extern struct dentry efs_fh_to_dentry(struct super_block sb, struct fid *fid,
134	int fh_len, int fh_type);
135	extern struct dentry efs_fh_to_parent(struct super_block sb, struct fid *fid,
136	int fh_len, int fh_type);
137	extern struct dentry efs_get_parent(struct dentry );
138	extern int efs_bmap(struct inode *, int);
139
140	#endif /* _EFS_EFS_H_ */