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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 1999 Al Smith
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
22static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>";
23
24
25/* 1 block is 512 bytes */
26#define EFS_BLOCKSIZE_BITS 9
27#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
28
29typedef int32_t efs_block_t;
30typedef uint32_t efs_ino_t;
31
32#define EFS_DIRECTEXTENTS 12
33
34/*
35 * layout of an extent, in memory and on disk. 8 bytes exactly.
36 */
37typedef union extent_u {
38 unsigned char raw[8];
39 struct extent_s {
40 unsigned int ex_magic:8; /* magic # (zero) */
41 unsigned int ex_bn:24; /* basic block */
42 unsigned int ex_length:8; /* numblocks in this extent */
43 unsigned int ex_offset:24; /* logical offset into file */
44 } cooked;
45} efs_extent;
46
47typedef struct edevs {
48 __be16 odev;
49 __be32 ndev;
50} efs_devs;
51
52/*
53 * extent based filesystem inode as it appears on disk. The efs inode
54 * is exactly 128 bytes long.
55 */
56struct efs_dinode {
57 __be16 di_mode; /* mode and type of file */
58 __be16 di_nlink; /* number of links to file */
59 __be16 di_uid; /* owner's user id */
60 __be16 di_gid; /* owner's group id */
61 __be32 di_size; /* number of bytes in file */
62 __be32 di_atime; /* time last accessed */
63 __be32 di_mtime; /* time last modified */
64 __be32 di_ctime; /* time created */
65 __be32 di_gen; /* generation number */
66 __be16 di_numextents; /* # of extents */
67 u_char di_version; /* version of inode */
68 u_char di_spare; /* spare - used by AFS */
69 union di_addr {
70 efs_extent di_extents[EFS_DIRECTEXTENTS];
71 efs_devs di_dev; /* device for IFCHR/IFBLK */
72 } di_u;
73};
74
75/* efs inode storage in memory */
76struct efs_inode_info {
77 int numextents;
78 int lastextent;
79
80 efs_extent extents[EFS_DIRECTEXTENTS];
81 struct inode vfs_inode;
82};
83
84#include <linux/efs_fs_sb.h>
85
86#define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS
87#define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS)
88
89struct efs_dentry {
90 __be32 inode;
91 unsigned char namelen;
92 char name[3];
93};
94
95#define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1)
96#define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1)
97
98#define EFS_DIRBLK_HEADERSIZE 4
99#define EFS_DIRBLK_MAGIC 0xbeef /* moo */
100
101struct efs_dir {
102 __be16 magic;
103 unsigned char firstused;
104 unsigned char slots;
105
106 unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
107};
108
109#define EFS_MAXENTS \
110 ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
111 (EFS_DENTSIZE + sizeof(char)))
112
113#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
114
115#define EFS_REALOFF(offset) ((offset << 1))
116
117
118static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
119{
120 return container_of(inode, struct efs_inode_info, vfs_inode);
121}
122
123static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
124{
125 return sb->s_fs_info;
126}
127
128struct statfs;
129struct fid;
130
131extern const struct inode_operations efs_dir_inode_operations;
132extern const struct file_operations efs_dir_operations;
133extern const struct address_space_operations efs_symlink_aops;
134
135extern struct inode *efs_iget(struct super_block *, unsigned long);
136extern efs_block_t efs_map_block(struct inode *, efs_block_t);
137extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
138
139extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
140extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
141 int fh_len, int fh_type);
142extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
143 int fh_len, int fh_type);
144extern struct dentry *efs_get_parent(struct dentry *);
145extern int efs_bmap(struct inode *, int);
146
147#endif /* _EFS_EFS_H_ */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 1999 Al Smith
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
22static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>";
23
24
25/* 1 block is 512 bytes */
26#define EFS_BLOCKSIZE_BITS 9
27#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
28
29typedef int32_t efs_block_t;
30typedef uint32_t efs_ino_t;
31
32#define EFS_DIRECTEXTENTS 12
33
34/*
35 * layout of an extent, in memory and on disk. 8 bytes exactly.
36 */
37typedef union extent_u {
38 unsigned char raw[8];
39 struct extent_s {
40 unsigned int ex_magic:8; /* magic # (zero) */
41 unsigned int ex_bn:24; /* basic block */
42 unsigned int ex_length:8; /* numblocks in this extent */
43 unsigned int ex_offset:24; /* logical offset into file */
44 } cooked;
45} efs_extent;
46
47typedef struct edevs {
48 __be16 odev;
49 __be32 ndev;
50} efs_devs;
51
52/*
53 * extent based filesystem inode as it appears on disk. The efs inode
54 * is exactly 128 bytes long.
55 */
56struct efs_dinode {
57 __be16 di_mode; /* mode and type of file */
58 __be16 di_nlink; /* number of links to file */
59 __be16 di_uid; /* owner's user id */
60 __be16 di_gid; /* owner's group id */
61 __be32 di_size; /* number of bytes in file */
62 __be32 di_atime; /* time last accessed */
63 __be32 di_mtime; /* time last modified */
64 __be32 di_ctime; /* time created */
65 __be32 di_gen; /* generation number */
66 __be16 di_numextents; /* # of extents */
67 u_char di_version; /* version of inode */
68 u_char di_spare; /* spare - used by AFS */
69 union di_addr {
70 efs_extent di_extents[EFS_DIRECTEXTENTS];
71 efs_devs di_dev; /* device for IFCHR/IFBLK */
72 } di_u;
73};
74
75/* efs inode storage in memory */
76struct efs_inode_info {
77 int numextents;
78 int lastextent;
79
80 efs_extent extents[EFS_DIRECTEXTENTS];
81 struct inode vfs_inode;
82};
83
84#include <linux/efs_fs_sb.h>
85
86#define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS
87#define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS)
88
89struct efs_dentry {
90 __be32 inode;
91 unsigned char namelen;
92 char name[3];
93};
94
95#define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1)
96#define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1)
97
98#define EFS_DIRBLK_HEADERSIZE 4
99#define EFS_DIRBLK_MAGIC 0xbeef /* moo */
100
101struct efs_dir {
102 __be16 magic;
103 unsigned char firstused;
104 unsigned char slots;
105
106 unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
107};
108
109#define EFS_MAXENTS \
110 ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
111 (EFS_DENTSIZE + sizeof(char)))
112
113#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
114
115#define EFS_REALOFF(offset) ((offset << 1))
116
117
118static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
119{
120 return container_of(inode, struct efs_inode_info, vfs_inode);
121}
122
123static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
124{
125 return sb->s_fs_info;
126}
127
128struct statfs;
129struct fid;
130
131extern const struct inode_operations efs_dir_inode_operations;
132extern const struct file_operations efs_dir_operations;
133extern const struct address_space_operations efs_symlink_aops;
134
135extern struct inode *efs_iget(struct super_block *, unsigned long);
136extern efs_block_t efs_map_block(struct inode *, efs_block_t);
137extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
138
139extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
140extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
141 int fh_len, int fh_type);
142extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
143 int fh_len, int fh_type);
144extern struct dentry *efs_get_parent(struct dentry *);
145extern int efs_bmap(struct inode *, int);
146
147#endif /* _EFS_EFS_H_ */