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 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 | |