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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <linux/fs.h>
3#include <linux/adfs_fs.h>
4
5/* Internal data structures for ADFS */
6
7#define ADFS_FREE_FRAG 0
8#define ADFS_BAD_FRAG 1
9#define ADFS_ROOT_FRAG 2
10
11#define ADFS_NDA_OWNER_READ (1 << 0)
12#define ADFS_NDA_OWNER_WRITE (1 << 1)
13#define ADFS_NDA_LOCKED (1 << 2)
14#define ADFS_NDA_DIRECTORY (1 << 3)
15#define ADFS_NDA_EXECUTE (1 << 4)
16#define ADFS_NDA_PUBLIC_READ (1 << 5)
17#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
18
19#include "dir_f.h"
20
21struct buffer_head;
22
23/*
24 * adfs file system inode data in memory
25 */
26struct adfs_inode_info {
27 loff_t mmu_private;
28 unsigned long parent_id; /* object id of parent */
29 __u32 loadaddr; /* RISC OS load address */
30 __u32 execaddr; /* RISC OS exec address */
31 unsigned int filetype; /* RISC OS file type */
32 unsigned int attr; /* RISC OS permissions */
33 unsigned int stamped:1; /* RISC OS file has date/time */
34 struct inode vfs_inode;
35};
36
37/*
38 * Forward-declare this
39 */
40struct adfs_discmap;
41struct adfs_dir_ops;
42
43/*
44 * ADFS file system superblock data in memory
45 */
46struct adfs_sb_info {
47 union { struct {
48 struct adfs_discmap *s_map; /* bh list containing map */
49 const struct adfs_dir_ops *s_dir; /* directory operations */
50 };
51 struct rcu_head rcu; /* used only at shutdown time */
52 };
53 kuid_t s_uid; /* owner uid */
54 kgid_t s_gid; /* owner gid */
55 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
56 umode_t s_other_mask; /* ADFS other perm -> unix perm */
57 int s_ftsuffix; /* ,xyz hex filetype suffix option */
58
59 __u32 s_ids_per_zone; /* max. no ids in one zone */
60 __u32 s_idlen; /* length of ID in map */
61 __u32 s_map_size; /* sector size of a map */
62 unsigned long s_size; /* total size (in blocks) of this fs */
63 signed int s_map2blk; /* shift left by this for map->sector*/
64 unsigned int s_log2sharesize;/* log2 share size */
65 __le32 s_version; /* disc format version */
66 unsigned int s_namelen; /* maximum number of characters in name */
67};
68
69static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
70{
71 return sb->s_fs_info;
72}
73
74static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
75{
76 return container_of(inode, struct adfs_inode_info, vfs_inode);
77}
78
79/*
80 * Directory handling
81 */
82struct adfs_dir {
83 struct super_block *sb;
84
85 int nr_buffers;
86 struct buffer_head *bh[4];
87
88 /* big directories need allocated buffers */
89 struct buffer_head **bh_fplus;
90
91 unsigned int pos;
92 unsigned int parent_id;
93
94 struct adfs_dirheader dirhead;
95 union adfs_dirtail dirtail;
96};
97
98/*
99 * This is the overall maximum name length
100 */
101#define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
102struct object_info {
103 __u32 parent_id; /* parent object id */
104 __u32 file_id; /* object id */
105 __u32 loadaddr; /* load address */
106 __u32 execaddr; /* execution address */
107 __u32 size; /* size */
108 __u8 attr; /* RISC OS attributes */
109 unsigned int name_len; /* name length */
110 char name[ADFS_MAX_NAME_LEN];/* file name */
111
112 /* RISC OS file type (12-bit: derived from loadaddr) */
113 __u16 filetype;
114};
115
116struct adfs_dir_ops {
117 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
118 int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
119 int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
120 int (*update)(struct adfs_dir *dir, struct object_info *obj);
121 int (*create)(struct adfs_dir *dir, struct object_info *obj);
122 int (*remove)(struct adfs_dir *dir, struct object_info *obj);
123 int (*sync)(struct adfs_dir *dir);
124 void (*free)(struct adfs_dir *dir);
125};
126
127struct adfs_discmap {
128 struct buffer_head *dm_bh;
129 __u32 dm_startblk;
130 unsigned int dm_startbit;
131 unsigned int dm_endbit;
132};
133
134/* Inode stuff */
135struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
136int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
137int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
138
139/* map.c */
140extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
141extern unsigned int adfs_map_free(struct super_block *sb);
142
143/* Misc */
144__printf(3, 4)
145void __adfs_error(struct super_block *sb, const char *function,
146 const char *fmt, ...);
147#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
148
149/* super.c */
150
151/*
152 * Inodes and file operations
153 */
154
155/* dir_*.c */
156extern const struct inode_operations adfs_dir_inode_operations;
157extern const struct file_operations adfs_dir_operations;
158extern const struct dentry_operations adfs_dentry_operations;
159extern const struct adfs_dir_ops adfs_f_dir_ops;
160extern const struct adfs_dir_ops adfs_fplus_dir_ops;
161
162void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
163extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
164 int wait);
165
166/* file.c */
167extern const struct inode_operations adfs_file_inode_operations;
168extern const struct file_operations adfs_file_operations;
169
170static inline __u32 signed_asl(__u32 val, signed int shift)
171{
172 if (shift >= 0)
173 val <<= shift;
174 else
175 val >>= -shift;
176 return val;
177}
178
179/*
180 * Calculate the address of a block in an object given the block offset
181 * and the object identity.
182 *
183 * The root directory ID should always be looked up in the map [3.4]
184 */
185static inline int
186__adfs_block_map(struct super_block *sb, unsigned int object_id,
187 unsigned int block)
188{
189 if (object_id & 255) {
190 unsigned int off;
191
192 off = (object_id & 255) - 1;
193 block += off << ADFS_SB(sb)->s_log2sharesize;
194 }
195
196 return adfs_map_lookup(sb, object_id >> 8, block);
197}