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
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
136 extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
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_ */
145
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