1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 1999 Al Smith, <Al.Smith@aeschi.ch.eu.org>
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
11#ifdef pr_fmt
12#undef pr_fmt
13#endif
14
15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17#include <linux/fs.h>
18#include <linux/uaccess.h>
19
20#define EFS_VERSION "1.0a"
21
22/* 1 block is 512 bytes */
23#define	EFS_BLOCKSIZE_BITS	9
24#define	EFS_BLOCKSIZE		(1 << EFS_BLOCKSIZE_BITS)
25
26typedef	int32_t		efs_block_t;
27typedef 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 */
34typedef 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
44typedef 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 */
53struct	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 */
73struct 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
86struct 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
98struct 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
115static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
116{
117	return container_of(inode, struct efs_inode_info, vfs_inode);
118}
119
120static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
121{
122	return sb->s_fs_info;
123}
124
125struct statfs;
126struct fid;
127
128extern const struct inode_operations efs_dir_inode_operations;
129extern const struct file_operations efs_dir_operations;
130extern const struct address_space_operations efs_symlink_aops;
131
132extern struct inode *efs_iget(struct super_block *, unsigned long);
133extern efs_block_t efs_map_block(struct inode *, efs_block_t);
134extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
135
136extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
137extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
138		int fh_len, int fh_type);
139extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
140		int fh_len, int fh_type);
141extern struct dentry *efs_get_parent(struct dentry *);
142extern int efs_bmap(struct inode *, int);
143
144#endif /* _EFS_EFS_H_ */
145