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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
608ba50b AV |
2 | #include <linux/fs.h> |
3 | #include <linux/adfs_fs.h> | |
4 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
19 | #include "dir_f.h" |
20 | ||
21 | struct buffer_head; | |
22 | ||
608ba50b AV |
23 | /* |
24 | * adfs file system inode data in memory | |
25 | */ | |
26 | struct 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 | */ | |
40 | struct adfs_discmap; | |
41 | struct adfs_dir_ops; | |
42 | ||
43 | /* | |
44 | * ADFS file system superblock data in memory | |
45 | */ | |
46 | struct adfs_sb_info { | |
2d1d9b5b | 47 | union { struct { |
90d6cd51 AM |
48 | struct adfs_discmap *s_map; /* bh list containing map */ |
49 | const struct adfs_dir_ops *s_dir; /* directory operations */ | |
2d1d9b5b | 50 | }; |
90d6cd51 | 51 | struct rcu_head rcu; /* used only at shutdown time */ |
2d1d9b5b | 52 | }; |
90d6cd51 AM |
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 */ | |
da23ef05 | 57 | int s_ftsuffix; /* ,xyz hex filetype suffix option */ |
608ba50b | 58 | |
90d6cd51 AM |
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 */ | |
608ba50b AV |
66 | unsigned int s_namelen; /* maximum number of characters in name */ |
67 | }; | |
68 | ||
69 | static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) | |
70 | { | |
71 | return sb->s_fs_info; | |
72 | } | |
73 | ||
74 | static inline struct adfs_inode_info *ADFS_I(struct inode *inode) | |
75 | { | |
76 | return container_of(inode, struct adfs_inode_info, vfs_inode); | |
77 | } | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Directory handling | |
81 | */ | |
82 | struct adfs_dir { | |
83 | struct super_block *sb; | |
84 | ||
85 | int nr_buffers; | |
86 | struct buffer_head *bh[4]; | |
2f09719a SS |
87 | |
88 | /* big directories need allocated buffers */ | |
89 | struct buffer_head **bh_fplus; | |
90 | ||
1da177e4 LT |
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 | */ | |
da23ef05 | 101 | #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ |
1da177e4 LT |
102 | struct 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 */ | |
da23ef05 | 109 | unsigned int name_len; /* name length */ |
1da177e4 | 110 | char name[ADFS_MAX_NAME_LEN];/* file name */ |
da23ef05 SS |
111 | |
112 | /* RISC OS file type (12-bit: derived from loadaddr) */ | |
113 | __u16 filetype; | |
1da177e4 LT |
114 | }; |
115 | ||
da23ef05 SS |
116 | /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */ |
117 | static inline int append_filetype_suffix(char *buf, __u16 filetype) | |
118 | { | |
135a9fcf | 119 | if (filetype == 0xffff) /* no explicit 12-bit file type was set */ |
da23ef05 SS |
120 | return 0; |
121 | ||
122 | *buf++ = ','; | |
123 | *buf++ = hex_asc_lo(filetype >> 8); | |
124 | *buf++ = hex_asc_lo(filetype >> 4); | |
125 | *buf++ = hex_asc_lo(filetype >> 0); | |
126 | return 4; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | struct adfs_dir_ops { |
130 | int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); | |
131 | int (*setpos)(struct adfs_dir *dir, unsigned int fpos); | |
132 | int (*getnext)(struct adfs_dir *dir, struct object_info *obj); | |
133 | int (*update)(struct adfs_dir *dir, struct object_info *obj); | |
134 | int (*create)(struct adfs_dir *dir, struct object_info *obj); | |
135 | int (*remove)(struct adfs_dir *dir, struct object_info *obj); | |
ffdc9064 | 136 | int (*sync)(struct adfs_dir *dir); |
1da177e4 LT |
137 | void (*free)(struct adfs_dir *dir); |
138 | }; | |
139 | ||
140 | struct adfs_discmap { | |
141 | struct buffer_head *dm_bh; | |
142 | __u32 dm_startblk; | |
143 | unsigned int dm_startbit; | |
144 | unsigned int dm_endbit; | |
145 | }; | |
146 | ||
147 | /* Inode stuff */ | |
148 | struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); | |
a9185b41 | 149 | int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); |
1da177e4 LT |
150 | int adfs_notify_change(struct dentry *dentry, struct iattr *attr); |
151 | ||
152 | /* map.c */ | |
153 | extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); | |
154 | extern unsigned int adfs_map_free(struct super_block *sb); | |
155 | ||
156 | /* Misc */ | |
19bdd41a | 157 | __printf(3, 4) |
1da177e4 LT |
158 | void __adfs_error(struct super_block *sb, const char *function, |
159 | const char *fmt, ...); | |
8e24eea7 | 160 | #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) |
1da177e4 LT |
161 | |
162 | /* super.c */ | |
163 | ||
164 | /* | |
165 | * Inodes and file operations | |
166 | */ | |
167 | ||
168 | /* dir_*.c */ | |
754661f1 | 169 | extern const struct inode_operations adfs_dir_inode_operations; |
4b6f5d20 | 170 | extern const struct file_operations adfs_dir_operations; |
e16404ed | 171 | extern const struct dentry_operations adfs_dentry_operations; |
0125f504 JL |
172 | extern const struct adfs_dir_ops adfs_f_dir_ops; |
173 | extern const struct adfs_dir_ops adfs_fplus_dir_ops; | |
1da177e4 | 174 | |
ffdc9064 AV |
175 | extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, |
176 | int wait); | |
1da177e4 LT |
177 | |
178 | /* file.c */ | |
754661f1 | 179 | extern const struct inode_operations adfs_file_inode_operations; |
4b6f5d20 | 180 | extern const struct file_operations adfs_file_operations; |
1da177e4 | 181 | |
e0c93142 | 182 | static inline __u32 signed_asl(__u32 val, signed int shift) |
1da177e4 LT |
183 | { |
184 | if (shift >= 0) | |
185 | val <<= shift; | |
186 | else | |
187 | val >>= -shift; | |
188 | return val; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Calculate the address of a block in an object given the block offset | |
193 | * and the object identity. | |
194 | * | |
195 | * The root directory ID should always be looked up in the map [3.4] | |
196 | */ | |
e0c93142 | 197 | static inline int |
1da177e4 LT |
198 | __adfs_block_map(struct super_block *sb, unsigned int object_id, |
199 | unsigned int block) | |
200 | { | |
201 | if (object_id & 255) { | |
202 | unsigned int off; | |
203 | ||
204 | off = (object_id & 255) - 1; | |
205 | block += off << ADFS_SB(sb)->s_log2sharesize; | |
206 | } | |
207 | ||
208 | return adfs_map_lookup(sb, object_id >> 8, block); | |
209 | } |