xref: /openbmc/linux/fs/adfs/adfs.h (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /* Internal data structures for ADFS */
2 
3 #define ADFS_FREE_FRAG		 0
4 #define ADFS_BAD_FRAG		 1
5 #define ADFS_ROOT_FRAG		 2
6 
7 #define ADFS_NDA_OWNER_READ	(1 << 0)
8 #define ADFS_NDA_OWNER_WRITE	(1 << 1)
9 #define ADFS_NDA_LOCKED		(1 << 2)
10 #define ADFS_NDA_DIRECTORY	(1 << 3)
11 #define ADFS_NDA_EXECUTE	(1 << 4)
12 #define ADFS_NDA_PUBLIC_READ	(1 << 5)
13 #define ADFS_NDA_PUBLIC_WRITE	(1 << 6)
14 
15 #include <linux/version.h>
16 #include "dir_f.h"
17 
18 struct buffer_head;
19 
20 /*
21  * Directory handling
22  */
23 struct adfs_dir {
24 	struct super_block	*sb;
25 
26 	int			nr_buffers;
27 	struct buffer_head	*bh[4];
28 	unsigned int		pos;
29 	unsigned int		parent_id;
30 
31 	struct adfs_dirheader	dirhead;
32 	union  adfs_dirtail	dirtail;
33 };
34 
35 /*
36  * This is the overall maximum name length
37  */
38 #define ADFS_MAX_NAME_LEN	256
39 struct object_info {
40 	__u32		parent_id;		/* parent object id	*/
41 	__u32		file_id;		/* object id		*/
42 	__u32		loadaddr;		/* load address		*/
43 	__u32		execaddr;		/* execution address	*/
44 	__u32		size;			/* size			*/
45 	__u8		attr;			/* RISC OS attributes	*/
46 	unsigned char	name_len;		/* name length		*/
47 	char		name[ADFS_MAX_NAME_LEN];/* file name		*/
48 };
49 
50 struct adfs_dir_ops {
51 	int	(*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
52 	int	(*setpos)(struct adfs_dir *dir, unsigned int fpos);
53 	int	(*getnext)(struct adfs_dir *dir, struct object_info *obj);
54 	int	(*update)(struct adfs_dir *dir, struct object_info *obj);
55 	int	(*create)(struct adfs_dir *dir, struct object_info *obj);
56 	int	(*remove)(struct adfs_dir *dir, struct object_info *obj);
57 	void	(*free)(struct adfs_dir *dir);
58 };
59 
60 struct adfs_discmap {
61 	struct buffer_head	*dm_bh;
62 	__u32			dm_startblk;
63 	unsigned int		dm_startbit;
64 	unsigned int		dm_endbit;
65 };
66 
67 /* Inode stuff */
68 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
69 int adfs_write_inode(struct inode *inode,int unused);
70 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
71 
72 /* map.c */
73 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
74 extern unsigned int adfs_map_free(struct super_block *sb);
75 
76 /* Misc */
77 void __adfs_error(struct super_block *sb, const char *function,
78 		  const char *fmt, ...);
79 #define adfs_error(sb, fmt...) __adfs_error(sb, __FUNCTION__, fmt)
80 
81 /* super.c */
82 
83 /*
84  * Inodes and file operations
85  */
86 
87 /* dir_*.c */
88 extern struct inode_operations adfs_dir_inode_operations;
89 extern struct file_operations adfs_dir_operations;
90 extern struct dentry_operations adfs_dentry_operations;
91 extern struct adfs_dir_ops adfs_f_dir_ops;
92 extern struct adfs_dir_ops adfs_fplus_dir_ops;
93 
94 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
95 
96 /* file.c */
97 extern struct inode_operations adfs_file_inode_operations;
98 extern struct file_operations adfs_file_operations;
99 
100 static inline __u32 signed_asl(__u32 val, signed int shift)
101 {
102 	if (shift >= 0)
103 		val <<= shift;
104 	else
105 		val >>= -shift;
106 	return val;
107 }
108 
109 /*
110  * Calculate the address of a block in an object given the block offset
111  * and the object identity.
112  *
113  * The root directory ID should always be looked up in the map [3.4]
114  */
115 static inline int
116 __adfs_block_map(struct super_block *sb, unsigned int object_id,
117 		 unsigned int block)
118 {
119 	if (object_id & 255) {
120 		unsigned int off;
121 
122 		off = (object_id & 255) - 1;
123 		block += off << ADFS_SB(sb)->s_log2sharesize;
124 	}
125 
126 	return adfs_map_lookup(sb, object_id >> 8, block);
127 }
128