tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/fs.h>
2#include <linux/adfs_fs.h>
3
4/* Internal data structures for ADFS */
5
6#define ADFS_FREE_FRAG 0
7#define ADFS_BAD_FRAG 1
8#define ADFS_ROOT_FRAG 2
9
10#define ADFS_NDA_OWNER_READ (1 << 0)
11#define ADFS_NDA_OWNER_WRITE (1 << 1)
12#define ADFS_NDA_LOCKED (1 << 2)
13#define ADFS_NDA_DIRECTORY (1 << 3)
14#define ADFS_NDA_EXECUTE (1 << 4)
15#define ADFS_NDA_PUBLIC_READ (1 << 5)
16#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
17
18#include "dir_f.h"
19
20struct buffer_head;
21
22/*
23 * adfs file system inode data in memory
24 */
25struct adfs_inode_info {
26 loff_t mmu_private;
27 unsigned long parent_id; /* object id of parent */
28 __u32 loadaddr; /* RISC OS load address */
29 __u32 execaddr; /* RISC OS exec address */
30 unsigned int filetype; /* RISC OS file type */
31 unsigned int attr; /* RISC OS permissions */
32 unsigned int stamped:1; /* RISC OS file has date/time */
33 struct inode vfs_inode;
34};
35
36/*
37 * Forward-declare this
38 */
39struct adfs_discmap;
40struct adfs_dir_ops;
41
42/*
43 * ADFS file system superblock data in memory
44 */
45struct adfs_sb_info {
46 struct adfs_discmap *s_map; /* bh list containing map */
47 struct adfs_dir_ops *s_dir; /* directory operations */
48
49 uid_t s_uid; /* owner uid */
50 gid_t s_gid; /* owner gid */
51 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
52 umode_t s_other_mask; /* ADFS other perm -> unix perm */
53
54 __u32 s_ids_per_zone; /* max. no ids in one zone */
55 __u32 s_idlen; /* length of ID in map */
56 __u32 s_map_size; /* sector size of a map */
57 unsigned long s_size; /* total size (in blocks) of this fs */
58 signed int s_map2blk; /* shift left by this for map->sector */
59 unsigned int s_log2sharesize;/* log2 share size */
60 __le32 s_version; /* disc format version */
61 unsigned int s_namelen; /* maximum number of characters in name */
62};
63
64static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
65{
66 return sb->s_fs_info;
67}
68
69static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
70{
71 return container_of(inode, struct adfs_inode_info, vfs_inode);
72}
73
74/*
75 * Directory handling
76 */
77struct adfs_dir {
78 struct super_block *sb;
79
80 int nr_buffers;
81 struct buffer_head *bh[4];
82 unsigned int pos;
83 unsigned int parent_id;
84
85 struct adfs_dirheader dirhead;
86 union adfs_dirtail dirtail;
87};
88
89/*
90 * This is the overall maximum name length
91 */
92#define ADFS_MAX_NAME_LEN 256
93struct object_info {
94 __u32 parent_id; /* parent object id */
95 __u32 file_id; /* object id */
96 __u32 loadaddr; /* load address */
97 __u32 execaddr; /* execution address */
98 __u32 size; /* size */
99 __u8 attr; /* RISC OS attributes */
100 unsigned char name_len; /* name length */
101 char name[ADFS_MAX_NAME_LEN];/* file name */
102};
103
104struct adfs_dir_ops {
105 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
106 int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
107 int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
108 int (*update)(struct adfs_dir *dir, struct object_info *obj);
109 int (*create)(struct adfs_dir *dir, struct object_info *obj);
110 int (*remove)(struct adfs_dir *dir, struct object_info *obj);
111 int (*sync)(struct adfs_dir *dir);
112 void (*free)(struct adfs_dir *dir);
113};
114
115struct adfs_discmap {
116 struct buffer_head *dm_bh;
117 __u32 dm_startblk;
118 unsigned int dm_startbit;
119 unsigned int dm_endbit;
120};
121
122/* Inode stuff */
123struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
124int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
125int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
126
127/* map.c */
128extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
129extern unsigned int adfs_map_free(struct super_block *sb);
130
131/* Misc */
132void __adfs_error(struct super_block *sb, const char *function,
133 const char *fmt, ...);
134#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
135
136/* super.c */
137
138/*
139 * Inodes and file operations
140 */
141
142/* dir_*.c */
143extern const struct inode_operations adfs_dir_inode_operations;
144extern const struct file_operations adfs_dir_operations;
145extern const struct dentry_operations adfs_dentry_operations;
146extern struct adfs_dir_ops adfs_f_dir_ops;
147extern struct adfs_dir_ops adfs_fplus_dir_ops;
148
149extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
150 int wait);
151
152/* file.c */
153extern const struct inode_operations adfs_file_inode_operations;
154extern const struct file_operations adfs_file_operations;
155
156static inline __u32 signed_asl(__u32 val, signed int shift)
157{
158 if (shift >= 0)
159 val <<= shift;
160 else
161 val >>= -shift;
162 return val;
163}
164
165/*
166 * Calculate the address of a block in an object given the block offset
167 * and the object identity.
168 *
169 * The root directory ID should always be looked up in the map [3.4]
170 */
171static inline int
172__adfs_block_map(struct super_block *sb, unsigned int object_id,
173 unsigned int block)
174{
175 if (object_id & 255) {
176 unsigned int off;
177
178 off = (object_id & 255) - 1;
179 block += off << ADFS_SB(sb)->s_log2sharesize;
180 }
181
182 return adfs_map_lookup(sb, object_id >> 8, block);
183}