1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #include <linux/buffer_head.h> |
3 | #include <linux/fs.h> |
4 | #include <linux/adfs_fs.h> |
5 | |
6 | /* Internal data structures for ADFS */ |
7 | |
8 | #define ADFS_FREE_FRAG 0 |
9 | #define ADFS_BAD_FRAG 1 |
10 | #define ADFS_ROOT_FRAG 2 |
11 | |
12 | #define ADFS_FILETYPE_NONE ((u16)~0) |
13 | |
14 | /* RISC OS 12-bit filetype is stored in load_address[19:8] */ |
15 | static inline u16 adfs_filetype(u32 loadaddr) |
16 | { |
17 | return (loadaddr & 0xfff00000) == 0xfff00000 ? |
18 | (loadaddr >> 8) & 0xfff : ADFS_FILETYPE_NONE; |
19 | } |
20 | |
21 | #define ADFS_NDA_OWNER_READ (1 << 0) |
22 | #define ADFS_NDA_OWNER_WRITE (1 << 1) |
23 | #define ADFS_NDA_LOCKED (1 << 2) |
24 | #define ADFS_NDA_DIRECTORY (1 << 3) |
25 | #define ADFS_NDA_EXECUTE (1 << 4) |
26 | #define ADFS_NDA_PUBLIC_READ (1 << 5) |
27 | #define ADFS_NDA_PUBLIC_WRITE (1 << 6) |
28 | |
29 | /* |
30 | * adfs file system inode data in memory |
31 | */ |
32 | struct adfs_inode_info { |
33 | loff_t mmu_private; |
34 | __u32 parent_id; /* parent indirect disc address */ |
35 | __u32 indaddr; /* object indirect disc address */ |
36 | __u32 loadaddr; /* RISC OS load address */ |
37 | __u32 execaddr; /* RISC OS exec address */ |
38 | unsigned int attr; /* RISC OS permissions */ |
39 | struct inode vfs_inode; |
40 | }; |
41 | |
42 | static inline struct adfs_inode_info *ADFS_I(struct inode *inode) |
43 | { |
44 | return container_of(inode, struct adfs_inode_info, vfs_inode); |
45 | } |
46 | |
47 | static inline bool adfs_inode_is_stamped(struct inode *inode) |
48 | { |
49 | return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000; |
50 | } |
51 | |
52 | /* |
53 | * Forward-declare this |
54 | */ |
55 | struct adfs_discmap; |
56 | struct adfs_dir_ops; |
57 | |
58 | /* |
59 | * ADFS file system superblock data in memory |
60 | */ |
61 | struct adfs_sb_info { |
62 | union { struct { |
63 | struct adfs_discmap *s_map; /* bh list containing map */ |
64 | const struct adfs_dir_ops *s_dir; /* directory operations */ |
65 | }; |
66 | struct rcu_head rcu; /* used only at shutdown time */ |
67 | }; |
68 | kuid_t s_uid; /* owner uid */ |
69 | kgid_t s_gid; /* owner gid */ |
70 | umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ |
71 | umode_t s_other_mask; /* ADFS other perm -> unix perm */ |
72 | int s_ftsuffix; /* ,xyz hex filetype suffix option */ |
73 | |
74 | __u32 s_ids_per_zone; /* max. no ids in one zone */ |
75 | __u32 s_idlen; /* length of ID in map */ |
76 | __u32 s_map_size; /* sector size of a map */ |
77 | signed int s_map2blk; /* shift left by this for map->sector*/ |
78 | unsigned int s_log2sharesize;/* log2 share size */ |
79 | unsigned int s_namelen; /* maximum number of characters in name */ |
80 | }; |
81 | |
82 | static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) |
83 | { |
84 | return sb->s_fs_info; |
85 | } |
86 | |
87 | /* |
88 | * Directory handling |
89 | */ |
90 | struct adfs_dir { |
91 | struct super_block *sb; |
92 | |
93 | int nr_buffers; |
94 | struct buffer_head *bh[4]; |
95 | struct buffer_head **bhs; |
96 | |
97 | unsigned int pos; |
98 | __u32 parent_id; |
99 | |
100 | union { |
101 | struct *dirhead; |
102 | struct *bighead; |
103 | }; |
104 | union { |
105 | struct adfs_newdirtail *newtail; |
106 | struct adfs_bigdirtail *bigtail; |
107 | }; |
108 | }; |
109 | |
110 | /* |
111 | * This is the overall maximum name length |
112 | */ |
113 | #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ |
114 | struct object_info { |
115 | __u32 parent_id; /* parent object id */ |
116 | __u32 indaddr; /* indirect disc addr */ |
117 | __u32 loadaddr; /* load address */ |
118 | __u32 execaddr; /* execution address */ |
119 | __u32 size; /* size */ |
120 | __u8 attr; /* RISC OS attributes */ |
121 | unsigned int name_len; /* name length */ |
122 | char name[ADFS_MAX_NAME_LEN];/* file name */ |
123 | }; |
124 | |
125 | struct adfs_dir_ops { |
126 | int (*read)(struct super_block *sb, unsigned int indaddr, |
127 | unsigned int size, struct adfs_dir *dir); |
128 | int (*iterate)(struct adfs_dir *dir, struct dir_context *ctx); |
129 | int (*setpos)(struct adfs_dir *dir, unsigned int fpos); |
130 | int (*getnext)(struct adfs_dir *dir, struct object_info *obj); |
131 | int (*update)(struct adfs_dir *dir, struct object_info *obj); |
132 | int (*create)(struct adfs_dir *dir, struct object_info *obj); |
133 | int (*remove)(struct adfs_dir *dir, struct object_info *obj); |
134 | int (*commit)(struct adfs_dir *dir); |
135 | }; |
136 | |
137 | struct adfs_discmap { |
138 | struct buffer_head *dm_bh; |
139 | __u32 dm_startblk; |
140 | unsigned int dm_startbit; |
141 | unsigned int dm_endbit; |
142 | }; |
143 | |
144 | /* Inode stuff */ |
145 | struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); |
146 | int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); |
147 | int adfs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry, |
148 | struct iattr *attr); |
149 | |
150 | /* map.c */ |
151 | int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset); |
152 | void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf); |
153 | struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr); |
154 | void adfs_free_map(struct super_block *sb); |
155 | |
156 | /* Misc */ |
157 | __printf(3, 4) |
158 | void __adfs_error(struct super_block *sb, const char *function, |
159 | const char *fmt, ...); |
160 | #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) |
161 | void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...); |
162 | |
163 | /* super.c */ |
164 | |
165 | /* |
166 | * Inodes and file operations |
167 | */ |
168 | |
169 | /* dir_*.c */ |
170 | extern const struct inode_operations adfs_dir_inode_operations; |
171 | extern const struct file_operations adfs_dir_operations; |
172 | extern const struct dentry_operations adfs_dentry_operations; |
173 | extern const struct adfs_dir_ops adfs_f_dir_ops; |
174 | extern const struct adfs_dir_ops adfs_fplus_dir_ops; |
175 | |
176 | int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset, |
177 | size_t len); |
178 | int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src, |
179 | size_t len); |
180 | void adfs_dir_relse(struct adfs_dir *dir); |
181 | int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr, |
182 | unsigned int size, struct adfs_dir *dir); |
183 | void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); |
184 | extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, |
185 | int wait); |
186 | |
187 | /* file.c */ |
188 | extern const struct inode_operations adfs_file_inode_operations; |
189 | extern const struct file_operations adfs_file_operations; |
190 | |
191 | static inline __u32 signed_asl(__u32 val, signed int shift) |
192 | { |
193 | if (shift >= 0) |
194 | val <<= shift; |
195 | else |
196 | val >>= -shift; |
197 | return val; |
198 | } |
199 | |
200 | /* |
201 | * Calculate the address of a block in an object given the block offset |
202 | * and the object identity. |
203 | * |
204 | * The root directory ID should always be looked up in the map [3.4] |
205 | */ |
206 | static inline int __adfs_block_map(struct super_block *sb, u32 indaddr, |
207 | unsigned int block) |
208 | { |
209 | if (indaddr & 255) { |
210 | unsigned int off; |
211 | |
212 | off = (indaddr & 255) - 1; |
213 | block += off << ADFS_SB(sb)->s_log2sharesize; |
214 | } |
215 | |
216 | return adfs_map_lookup(sb, frag_id: indaddr >> 8, offset: block); |
217 | } |
218 | |
219 | /* Return the disc record from the map */ |
220 | static inline |
221 | struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm) |
222 | { |
223 | return (void *)(dm[0].dm_bh->b_data + 4); |
224 | } |
225 | |
226 | static inline u64 adfs_disc_size(const struct adfs_discrecord *dr) |
227 | { |
228 | return (u64)le32_to_cpu(dr->disc_size_high) << 32 | |
229 | le32_to_cpu(dr->disc_size); |
230 | } |
231 | |