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