1 /*
2 * Copyright (c) 1999 Al Smith
3 *
4 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
5 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
6 */
7 #ifndef _EFS_EFS_H_
8 #define _EFS_EFS_H_
9
10 #include <linux/fs.h>
11 #include <asm/uaccess.h>
12
13 #define EFS_VERSION "1.0a"
14
15 static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>";
16
17
18 /* 1 block is 512 bytes */
19 #define EFS_BLOCKSIZE_BITS 9
20 #define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
21
22 typedef int32_t efs_block_t;
23 typedef uint32_t efs_ino_t;
24
25 #define EFS_DIRECTEXTENTS 12
26
27 /*
28 * layout of an extent, in memory and on disk. 8 bytes exactly.
29 */
30 typedef union extent_u {
31 unsigned char raw[8];
32 struct extent_s {
33 unsigned int ex_magic:8; /* magic # (zero) */
34 unsigned int ex_bn:24; /* basic block */
35 unsigned int ex_length:8; /* numblocks in this extent */
36 unsigned int ex_offset:24; /* logical offset into file */
37 } cooked;
38 } efs_extent;
39
40 typedef struct edevs {
41 __be16 odev;
42 __be32 ndev;
43 } efs_devs;
44
45 /*
46 * extent based filesystem inode as it appears on disk. The efs inode
47 * is exactly 128 bytes long.
48 */
49 struct efs_dinode {
50 __be16 di_mode; /* mode and type of file */
51 __be16 di_nlink; /* number of links to file */
52 __be16 di_uid; /* owner's user id */
53 __be16 di_gid; /* owner's group id */
54 __be32 di_size; /* number of bytes in file */
55 __be32 di_atime; /* time last accessed */
56 __be32 di_mtime; /* time last modified */
57 __be32 di_ctime; /* time created */
58 __be32 di_gen; /* generation number */
59 __be16 di_numextents; /* # of extents */
60 u_char di_version; /* version of inode */
61 u_char di_spare; /* spare - used by AFS */
62 union di_addr {
63 efs_extent di_extents[EFS_DIRECTEXTENTS];
64 efs_devs di_dev; /* device for IFCHR/IFBLK */
65 } di_u;
66 };
67
68 /* efs inode storage in memory */
69 struct efs_inode_info {
70 int numextents;
71 int lastextent;
72
73 efs_extent extents[EFS_DIRECTEXTENTS];
74 struct inode vfs_inode;
75 };
76
77 #include <linux/efs_fs_sb.h>
78
79 #define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS
80 #define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS)
81
82 struct efs_dentry {
83 __be32 inode;
84 unsigned char namelen;
85 char name[3];
86 };
87
88 #define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1)
89 #define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1)
90
91 #define EFS_DIRBLK_HEADERSIZE 4
92 #define EFS_DIRBLK_MAGIC 0xbeef /* moo */
93
94 struct efs_dir {
95 __be16 magic;
96 unsigned char firstused;
97 unsigned char slots;
98
99 unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
100 };
101
102 #define EFS_MAXENTS \
103 ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
104 (EFS_DENTSIZE + sizeof(char)))
105
106 #define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
107
108 #define EFS_REALOFF(offset) ((offset << 1))
109
110
INODE_INFO(struct inode * inode)111 static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
112 {
113 return container_of(inode, struct efs_inode_info, vfs_inode);
114 }
115
SUPER_INFO(struct super_block * sb)116 static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
117 {
118 return sb->s_fs_info;
119 }
120
121 struct statfs;
122 struct fid;
123
124 extern const struct inode_operations efs_dir_inode_operations;
125 extern const struct file_operations efs_dir_operations;
126 extern const struct address_space_operations efs_symlink_aops;
127
128 extern struct inode *efs_iget(struct super_block *, unsigned long);
129 extern efs_block_t efs_map_block(struct inode *, efs_block_t);
130 extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
131
132 extern struct dentry *efs_lookup(struct inode *, struct dentry *, struct nameidata *);
133 extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
134 int fh_len, int fh_type);
135 extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
136 int fh_len, int fh_type);
137 extern struct dentry *efs_get_parent(struct dentry *);
138 extern int efs_bmap(struct inode *, int);
139
140 #endif /* _EFS_EFS_H_ */
141