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

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 1999 Al Smith, <[email protected]>
 *
 * 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_

#ifdef pr_fmt
#undef pr_fmt
#endif

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#define EFS_VERSION "1.0a"

/* 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 *, unsigned int);
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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
45254b4f	2	/*
bbe3656a	3	* Copyright (c) 1999 Al Smith, <[email protected]>
45254b4f CH	4	*
	5	* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
	6	* Portions derived from IRIX header files (c) 1988 Silicon Graphics
	7	*/
	8	#ifndef _EFS_EFS_H_
	9	#define _EFS_EFS_H_
	10
f403d1db FF	11	#ifdef pr_fmt
	12	#undef pr_fmt
	13	#endif
	14
	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	16
45254b4f	17	#include <linux/fs.h>
7c0f6ba6	18	#include <linux/uaccess.h>
45254b4f CH	19
	20	#define EFS_VERSION "1.0a"
	21
45254b4f CH	22	/* 1 block is 512 bytes */
	23	#define EFS_BLOCKSIZE_BITS 9
	24	#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
	25
	26	typedef int32_t efs_block_t;
	27	typedef uint32_t efs_ino_t;
	28
	29	#define EFS_DIRECTEXTENTS 12
	30
	31	/*
	32	* layout of an extent, in memory and on disk. 8 bytes exactly.
	33	*/
	34	typedef union extent_u {
	35	unsigned char raw[8];
	36	struct extent_s {
	37	unsigned int ex_magic:8; /* magic # (zero) */
	38	unsigned int ex_bn:24; /* basic block */
	39	unsigned int ex_length:8; /* numblocks in this extent */
	40	unsigned int ex_offset:24; /* logical offset into file */
	41	} cooked;
	42	} efs_extent;
	43
	44	typedef struct edevs {
	45	__be16 odev;
	46	__be32 ndev;
	47	} efs_devs;
	48
	49	/*
	50	* extent based filesystem inode as it appears on disk. The efs inode
	51	* is exactly 128 bytes long.
	52	*/
	53	struct efs_dinode {
	54	__be16 di_mode; /* mode and type of file */
	55	__be16 di_nlink; /* number of links to file */
	56	__be16 di_uid; /* owner's user id */
	57	__be16 di_gid; /* owner's group id */
	58	__be32 di_size; /* number of bytes in file */
	59	__be32 di_atime; /* time last accessed */
	60	__be32 di_mtime; /* time last modified */
	61	__be32 di_ctime; /* time created */
	62	__be32 di_gen; /* generation number */
	63	__be16 di_numextents; /* # of extents */
	64	u_char di_version; /* version of inode */
	65	u_char di_spare; /* spare - used by AFS */
	66	union di_addr {
	67	efs_extent di_extents[EFS_DIRECTEXTENTS];
	68	efs_devs di_dev; /* device for IFCHR/IFBLK */
	69	} di_u;
	70	};
	71
	72	/* efs inode storage in memory */
	73	struct efs_inode_info {
	74	int numextents;
	75	int lastextent;
	76
	77	efs_extent extents[EFS_DIRECTEXTENTS];
	78	struct inode vfs_inode;
	79	};
	80
	81	#include <linux/efs_fs_sb.h>
	82
	83	#define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS
	84	#define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS)
	85
86	struct efs_dentry {
87	__be32 inode;
88	unsigned char namelen;
89	char name[3];
90	};
91
92	#define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1)
93	#define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1)
94
95	#define EFS_DIRBLK_HEADERSIZE 4
96	#define EFS_DIRBLK_MAGIC 0xbeef /* moo */
97
98	struct efs_dir {
99	__be16 magic;
100	unsigned char firstused;
101	unsigned char slots;
102
103	unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
104	};
105
106	#define EFS_MAXENTS \
107	((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
108	(EFS_DENTSIZE + sizeof(char)))
109
110	#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
111
112	#define EFS_REALOFF(offset) ((offset << 1))
113
114
115	static inline struct efs_inode_info INODE_INFO(struct inode inode)
116	{
117	return container_of(inode, struct efs_inode_info, vfs_inode);
118	}
119
120	static inline struct efs_sb_info SUPER_INFO(struct super_block sb)
121	{
122	return sb->s_fs_info;
123	}
124
125	struct statfs;
126	struct fid;
127
128	extern const struct inode_operations efs_dir_inode_operations;
129	extern const struct file_operations efs_dir_operations;
130	extern const struct address_space_operations efs_symlink_aops;
131
132	extern struct inode efs_iget(struct super_block , unsigned long);
133	extern efs_block_t efs_map_block(struct inode *, efs_block_t);
134	extern int efs_get_block(struct inode , sector_t, struct buffer_head , int);
135
00cd8dd3	136	extern struct dentry efs_lookup(struct inode , struct dentry *, unsigned int);
45254b4f CH	137	extern struct dentry efs_fh_to_dentry(struct super_block sb, struct fid *fid,
	138	int fh_len, int fh_type);
	139	extern struct dentry efs_fh_to_parent(struct super_block sb, struct fid *fid,
	140	int fh_len, int fh_type);
	141	extern struct dentry efs_get_parent(struct dentry );
	142	extern int efs_bmap(struct inode *, int);
	143
	144	#endif /* _EFS_EFS_H_ */