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
20 struct buffer_head;
21
22 /*
23 * adfs file system inode data in memory
24 */
25 struct 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 */
39 struct adfs_discmap;
40 struct adfs_dir_ops;
41
42 /*
43 * ADFS file system superblock data in memory
44 */
45 struct adfs_sb_info {
46 union { struct {
47 struct adfs_discmap *s_map; /* bh list containing map */
48 struct adfs_dir_ops *s_dir; /* directory operations */
49 };
50 struct rcu_head rcu; /* used only at shutdown time */
51 };
52 kuid_t s_uid; /* owner uid */
53 kgid_t s_gid; /* owner gid */
54 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
55 umode_t s_other_mask; /* ADFS other perm -> unix perm */
56 int s_ftsuffix; /* ,xyz hex filetype suffix option */
57
58 __u32 s_ids_per_zone; /* max. no ids in one zone */
59 __u32 s_idlen; /* length of ID in map */
60 __u32 s_map_size; /* sector size of a map */
61 unsigned long s_size; /* total size (in blocks) of this fs */
62 signed int s_map2blk; /* shift left by this for map->sector */
63 unsigned int s_log2sharesize;/* log2 share size */
64 __le32 s_version; /* disc format version */
65 unsigned int s_namelen; /* maximum number of characters in name */
66 };
67
ADFS_SB(struct super_block * sb)68 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
69 {
70 return sb->s_fs_info;
71 }
72
ADFS_I(struct inode * inode)73 static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
74 {
75 return container_of(inode, struct adfs_inode_info, vfs_inode);
76 }
77
78 /*
79 * Directory handling
80 */
81 struct adfs_dir {
82 struct super_block *sb;
83
84 int nr_buffers;
85 struct buffer_head *bh[4];
86
87 /* big directories need allocated buffers */
88 struct buffer_head **bh_fplus;
89
90 unsigned int pos;
91 unsigned int parent_id;
92
93 struct adfs_dirheader dirhead;
94 union adfs_dirtail dirtail;
95 };
96
97 /*
98 * This is the overall maximum name length
99 */
100 #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
101 struct object_info {
102 __u32 parent_id; /* parent object id */
103 __u32 file_id; /* object id */
104 __u32 loadaddr; /* load address */
105 __u32 execaddr; /* execution address */
106 __u32 size; /* size */
107 __u8 attr; /* RISC OS attributes */
108 unsigned int name_len; /* name length */
109 char name[ADFS_MAX_NAME_LEN];/* file name */
110
111 /* RISC OS file type (12-bit: derived from loadaddr) */
112 __u16 filetype;
113 };
114
115 /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
append_filetype_suffix(char * buf,__u16 filetype)116 static inline int append_filetype_suffix(char *buf, __u16 filetype)
117 {
118 if (filetype == 0xffff) /* no explicit 12-bit file type was set */
119 return 0;
120
121 *buf++ = ',';
122 *buf++ = hex_asc_lo(filetype >> 8);
123 *buf++ = hex_asc_lo(filetype >> 4);
124 *buf++ = hex_asc_lo(filetype >> 0);
125 return 4;
126 }
127
128 struct adfs_dir_ops {
129 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
130 int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
131 int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
132 int (*update)(struct adfs_dir *dir, struct object_info *obj);
133 int (*create)(struct adfs_dir *dir, struct object_info *obj);
134 int (*remove)(struct adfs_dir *dir, struct object_info *obj);
135 int (*sync)(struct adfs_dir *dir);
136 void (*free)(struct adfs_dir *dir);
137 };
138
139 struct adfs_discmap {
140 struct buffer_head *dm_bh;
141 __u32 dm_startblk;
142 unsigned int dm_startbit;
143 unsigned int dm_endbit;
144 };
145
146 /* Inode stuff */
147 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
148 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
149 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
150
151 /* map.c */
152 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
153 extern unsigned int adfs_map_free(struct super_block *sb);
154
155 /* Misc */
156 __printf(3, 4)
157 void __adfs_error(struct super_block *sb, const char *function,
158 const char *fmt, ...);
159 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
160
161 /* super.c */
162
163 /*
164 * Inodes and file operations
165 */
166
167 /* dir_*.c */
168 extern const struct inode_operations adfs_dir_inode_operations;
169 extern const struct file_operations adfs_dir_operations;
170 extern const struct dentry_operations adfs_dentry_operations;
171 extern struct adfs_dir_ops adfs_f_dir_ops;
172 extern struct adfs_dir_ops adfs_fplus_dir_ops;
173
174 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
175 int wait);
176
177 /* file.c */
178 extern const struct inode_operations adfs_file_inode_operations;
179 extern const struct file_operations adfs_file_operations;
180
signed_asl(__u32 val,signed int shift)181 static inline __u32 signed_asl(__u32 val, signed int shift)
182 {
183 if (shift >= 0)
184 val <<= shift;
185 else
186 val >>= -shift;
187 return val;
188 }
189
190 /*
191 * Calculate the address of a block in an object given the block offset
192 * and the object identity.
193 *
194 * The root directory ID should always be looked up in the map [3.4]
195 */
196 static inline int
__adfs_block_map(struct super_block * sb,unsigned int object_id,unsigned int block)197 __adfs_block_map(struct super_block *sb, unsigned int object_id,
198 unsigned int block)
199 {
200 if (object_id & 255) {
201 unsigned int off;
202
203 off = (object_id & 255) - 1;
204 block += off << ADFS_SB(sb)->s_log2sharesize;
205 }
206
207 return adfs_map_lookup(sb, object_id >> 8, block);
208 }
209