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gerrit-public.fairphone.software / kernel / msm / b6651129cc27d56a9cbefcb5f713cea7706fd6b7 / . / fs / adfs / adfs.h
blob: 63f5df9afb71f96c5e649fbb0f2c6cf3275513b6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
18struct buffer_head;
19
20/*
21 * Directory handling
22 */
23struct 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
39struct 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
50struct 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
60struct 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 */
68struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
69int adfs_write_inode(struct inode *inode,int unused);
70int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
71
72/* map.c */
73extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
74extern unsigned int adfs_map_free(struct super_block *sb);
75
76/* Misc */
77void __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 */
88extern struct inode_operations adfs_dir_inode_operations;
89extern struct file_operations adfs_dir_operations;
90extern struct dentry_operations adfs_dentry_operations;
91extern struct adfs_dir_ops adfs_f_dir_ops;
92extern struct adfs_dir_ops adfs_fplus_dir_ops;
93
94extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
95
96/* file.c */
97extern struct inode_operations adfs_file_inode_operations;
98extern struct file_operations adfs_file_operations;
99
100extern 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 */
115extern 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}