Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1dfdfc94 | 2 | #include <linux/buffer_head.h> |
608ba50b AV |
3 | #include <linux/fs.h> |
4 | #include <linux/adfs_fs.h> | |
5 | ||
1da177e4 LT |
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 | ||
b4ed8f75 RK |
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 | ||
1da177e4 LT |
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 | ||
608ba50b AV |
29 | /* |
30 | * adfs file system inode data in memory | |
31 | */ | |
32 | struct adfs_inode_info { | |
33 | loff_t mmu_private; | |
5ed70bb4 | 34 | __u32 parent_id; /* parent indirect disc address */ |
25e5d4df | 35 | __u32 indaddr; /* object indirect disc address */ |
608ba50b AV |
36 | __u32 loadaddr; /* RISC OS load address */ |
37 | __u32 execaddr; /* RISC OS exec address */ | |
608ba50b | 38 | unsigned int attr; /* RISC OS permissions */ |
608ba50b AV |
39 | struct inode vfs_inode; |
40 | }; | |
41 | ||
b4ed8f75 RK |
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 | ||
608ba50b AV |
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 { | |
2d1d9b5b | 62 | union { struct { |
90d6cd51 AM |
63 | struct adfs_discmap *s_map; /* bh list containing map */ |
64 | const struct adfs_dir_ops *s_dir; /* directory operations */ | |
2d1d9b5b | 65 | }; |
90d6cd51 | 66 | struct rcu_head rcu; /* used only at shutdown time */ |
2d1d9b5b | 67 | }; |
90d6cd51 AM |
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 */ | |
da23ef05 | 72 | int s_ftsuffix; /* ,xyz hex filetype suffix option */ |
608ba50b | 73 | |
90d6cd51 AM |
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 */ | |
90d6cd51 AM |
77 | signed int s_map2blk; /* shift left by this for map->sector*/ |
78 | unsigned int s_log2sharesize;/* log2 share size */ | |
608ba50b AV |
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 | ||
1da177e4 LT |
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]; | |
71b26127 | 95 | struct buffer_head **bhs; |
2f09719a | 96 | |
1da177e4 | 97 | unsigned int pos; |
5ed70bb4 | 98 | __u32 parent_id; |
1da177e4 | 99 | |
016936b3 RK |
100 | union { |
101 | struct adfs_dirheader *dirhead; | |
102 | struct adfs_bigdirheader *bighead; | |
103 | }; | |
104 | union { | |
105 | struct adfs_newdirtail *newtail; | |
106 | struct adfs_bigdirtail *bigtail; | |
107 | }; | |
1da177e4 LT |
108 | }; |
109 | ||
110 | /* | |
111 | * This is the overall maximum name length | |
112 | */ | |
da23ef05 | 113 | #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ |
1da177e4 LT |
114 | struct object_info { |
115 | __u32 parent_id; /* parent object id */ | |
5ed70bb4 | 116 | __u32 indaddr; /* indirect disc addr */ |
1da177e4 LT |
117 | __u32 loadaddr; /* load address */ |
118 | __u32 execaddr; /* execution address */ | |
119 | __u32 size; /* size */ | |
120 | __u8 attr; /* RISC OS attributes */ | |
da23ef05 | 121 | unsigned int name_len; /* name length */ |
1da177e4 LT |
122 | char name[ADFS_MAX_NAME_LEN];/* file name */ |
123 | }; | |
124 | ||
125 | struct adfs_dir_ops { | |
5ed70bb4 RK |
126 | int (*read)(struct super_block *sb, unsigned int indaddr, |
127 | unsigned int size, struct adfs_dir *dir); | |
4287e4de | 128 | int (*iterate)(struct adfs_dir *dir, struct dir_context *ctx); |
1da177e4 LT |
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); | |
aacc954c | 134 | int (*commit)(struct adfs_dir *dir); |
1da177e4 LT |
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); | |
a9185b41 | 146 | int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); |
549c7297 CB |
147 | int adfs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry, |
148 | struct iattr *attr); | |
1da177e4 LT |
149 | |
150 | /* map.c */ | |
5ed70bb4 | 151 | int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset); |
e6160e46 | 152 | void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf); |
f75d398d | 153 | struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr); |
7b195267 | 154 | void adfs_free_map(struct super_block *sb); |
1da177e4 LT |
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) |
ceb3b106 | 161 | void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...); |
1da177e4 LT |
162 | |
163 | /* super.c */ | |
164 | ||
165 | /* | |
166 | * Inodes and file operations | |
167 | */ | |
168 | ||
169 | /* dir_*.c */ | |
754661f1 | 170 | extern const struct inode_operations adfs_dir_inode_operations; |
4b6f5d20 | 171 | extern const struct file_operations adfs_dir_operations; |
e16404ed | 172 | extern const struct dentry_operations adfs_dentry_operations; |
0125f504 JL |
173 | extern const struct adfs_dir_ops adfs_f_dir_ops; |
174 | extern const struct adfs_dir_ops adfs_fplus_dir_ops; | |
1da177e4 | 175 | |
a317120b RK |
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); | |
1dd9f5ba | 180 | void adfs_dir_relse(struct adfs_dir *dir); |
419a6e5e RK |
181 | int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr, |
182 | unsigned int size, struct adfs_dir *dir); | |
411c49bc | 183 | void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); |
ffdc9064 AV |
184 | extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, |
185 | int wait); | |
1da177e4 LT |
186 | |
187 | /* file.c */ | |
754661f1 | 188 | extern const struct inode_operations adfs_file_inode_operations; |
4b6f5d20 | 189 | extern const struct file_operations adfs_file_operations; |
1da177e4 | 190 | |
e0c93142 | 191 | static inline __u32 signed_asl(__u32 val, signed int shift) |
1da177e4 LT |
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 | */ | |
5ed70bb4 RK |
206 | static inline int __adfs_block_map(struct super_block *sb, u32 indaddr, |
207 | unsigned int block) | |
1da177e4 | 208 | { |
5ed70bb4 | 209 | if (indaddr & 255) { |
1da177e4 LT |
210 | unsigned int off; |
211 | ||
5ed70bb4 | 212 | off = (indaddr & 255) - 1; |
1da177e4 LT |
213 | block += off << ADFS_SB(sb)->s_log2sharesize; |
214 | } | |
215 | ||
5ed70bb4 | 216 | return adfs_map_lookup(sb, indaddr >> 8, block); |
1da177e4 | 217 | } |
1dfdfc94 RK |
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 | } | |
275f5b99 RK |
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 | } |