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
17 /*
18 * Directory handling
19 */
20 struct adfs_dir {
21 struct super_block *sb;
22
23 int nr_buffers;
24 struct buffer_head *bh[4];
25 unsigned int pos;
26 unsigned int parent_id;
27
28 struct adfs_dirheader dirhead;
29 union adfs_dirtail dirtail;
30 };
31
32 /*
33 * This is the overall maximum name length
34 */
35 #define ADFS_MAX_NAME_LEN 256
36 struct object_info {
37 __u32 parent_id; /* parent object id */
38 __u32 file_id; /* object id */
39 __u32 loadaddr; /* load address */
40 __u32 execaddr; /* execution address */
41 __u32 size; /* size */
42 __u8 attr; /* RISC OS attributes */
43 unsigned char name_len; /* name length */
44 char name[ADFS_MAX_NAME_LEN];/* file name */
45 };
46
47 struct adfs_dir_ops {
48 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
49 int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
50 int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
51 int (*update)(struct adfs_dir *dir, struct object_info *obj);
52 int (*create)(struct adfs_dir *dir, struct object_info *obj);
53 int (*remove)(struct adfs_dir *dir, struct object_info *obj);
54 void (*free)(struct adfs_dir *dir);
55 };
56
57 struct adfs_discmap {
58 struct buffer_head *dm_bh;
59 __u32 dm_startblk;
60 unsigned int dm_startbit;
61 unsigned int dm_endbit;
62 };
63
64 /* dir stuff */
65
66
67 /* Inode stuff */
68 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0)
69 int adfs_get_block(struct inode *inode, long block,
70 struct buffer_head *bh, int create);
71 #else
72 int adfs_bmap(struct inode *inode, int block);
73 #endif
74 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
75 void adfs_read_inode(struct inode *inode);
76 void adfs_write_inode(struct inode *inode,int unused);
77 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
78
79 /* map.c */
80 extern int adfs_map_lookup(struct super_block *sb, int frag_id, int offset);
81 extern unsigned int adfs_map_free(struct super_block *sb);
82
83 /* Misc */
84 void __adfs_error(struct super_block *sb, const char *function,
85 const char *fmt, ...);
86 #define adfs_error(sb, fmt...) __adfs_error(sb, __FUNCTION__, fmt)
87
88 /* namei.c */
89 extern struct dentry *adfs_lookup(struct inode *dir, struct dentry *dentry);
90
91 /* super.c */
92
93 /*
94 * Inodes and file operations
95 */
96
97 /* dir_*.c */
98 extern struct inode_operations adfs_dir_inode_operations;
99 extern struct file_operations adfs_dir_operations;
100 extern struct dentry_operations adfs_dentry_operations;
101 extern struct adfs_dir_ops adfs_f_dir_ops;
102 extern struct adfs_dir_ops adfs_fplus_dir_ops;
103
104 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
105
106 /* file.c */
107 extern struct inode_operations adfs_file_inode_operations;
108 extern struct file_operations adfs_file_operations;
109
signed_asl(__u32 val,signed int shift)110 extern inline __u32 signed_asl(__u32 val, signed int shift)
111 {
112 if (shift >= 0)
113 val <<= shift;
114 else
115 val >>= -shift;
116 return val;
117 }
118
119 /*
120 * Calculate the address of a block in an object given the block offset
121 * and the object identity.
122 *
123 * The root directory ID should always be looked up in the map [3.4]
124 */
125 extern inline int
__adfs_block_map(struct super_block * sb,unsigned int object_id,unsigned int block)126 __adfs_block_map(struct super_block *sb, unsigned int object_id,
127 unsigned int block)
128 {
129 if (object_id & 255) {
130 unsigned int off;
131
132 off = (object_id & 255) - 1;
133 block += off << sb->u.adfs_sb.s_log2sharesize;
134 }
135
136 return adfs_map_lookup(sb, object_id >> 8, block);
137 }
138