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