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

source code of linux/fs/efs/efs.h