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Commit | Line | Data |
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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 | ||
1da177e4 LT |
29 | #include "dir_f.h" |
30 | ||
608ba50b AV |
31 | /* |
32 | * adfs file system inode data in memory | |
33 | */ | |
34 | struct adfs_inode_info { | |
35 | loff_t mmu_private; | |
5ed70bb4 | 36 | __u32 parent_id; /* parent indirect disc address */ |
608ba50b AV |
37 | __u32 loadaddr; /* RISC OS load address */ |
38 | __u32 execaddr; /* RISC OS exec address */ | |
608ba50b | 39 | unsigned int attr; /* RISC OS permissions */ |
608ba50b AV |
40 | struct inode vfs_inode; |
41 | }; | |
42 | ||
b4ed8f75 RK |
43 | static inline struct adfs_inode_info *ADFS_I(struct inode *inode) |
44 | { | |
45 | return container_of(inode, struct adfs_inode_info, vfs_inode); | |
46 | } | |
47 | ||
48 | static inline bool adfs_inode_is_stamped(struct inode *inode) | |
49 | { | |
50 | return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000; | |
51 | } | |
52 | ||
608ba50b AV |
53 | /* |
54 | * Forward-declare this | |
55 | */ | |
56 | struct adfs_discmap; | |
57 | struct adfs_dir_ops; | |
58 | ||
59 | /* | |
60 | * ADFS file system superblock data in memory | |
61 | */ | |
62 | struct adfs_sb_info { | |
2d1d9b5b | 63 | union { struct { |
90d6cd51 AM |
64 | struct adfs_discmap *s_map; /* bh list containing map */ |
65 | const struct adfs_dir_ops *s_dir; /* directory operations */ | |
2d1d9b5b | 66 | }; |
90d6cd51 | 67 | struct rcu_head rcu; /* used only at shutdown time */ |
2d1d9b5b | 68 | }; |
90d6cd51 AM |
69 | kuid_t s_uid; /* owner uid */ |
70 | kgid_t s_gid; /* owner gid */ | |
71 | umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ | |
72 | umode_t s_other_mask; /* ADFS other perm -> unix perm */ | |
da23ef05 | 73 | int s_ftsuffix; /* ,xyz hex filetype suffix option */ |
608ba50b | 74 | |
90d6cd51 AM |
75 | __u32 s_ids_per_zone; /* max. no ids in one zone */ |
76 | __u32 s_idlen; /* length of ID in map */ | |
77 | __u32 s_map_size; /* sector size of a map */ | |
90d6cd51 AM |
78 | signed int s_map2blk; /* shift left by this for map->sector*/ |
79 | unsigned int s_log2sharesize;/* log2 share size */ | |
608ba50b AV |
80 | unsigned int s_namelen; /* maximum number of characters in name */ |
81 | }; | |
82 | ||
83 | static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) | |
84 | { | |
85 | return sb->s_fs_info; | |
86 | } | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * Directory handling | |
90 | */ | |
91 | struct adfs_dir { | |
92 | struct super_block *sb; | |
93 | ||
94 | int nr_buffers; | |
95 | struct buffer_head *bh[4]; | |
2f09719a SS |
96 | |
97 | /* big directories need allocated buffers */ | |
98 | struct buffer_head **bh_fplus; | |
99 | ||
1da177e4 | 100 | unsigned int pos; |
5ed70bb4 | 101 | __u32 parent_id; |
1da177e4 LT |
102 | |
103 | struct adfs_dirheader dirhead; | |
104 | union adfs_dirtail dirtail; | |
105 | }; | |
106 | ||
107 | /* | |
108 | * This is the overall maximum name length | |
109 | */ | |
da23ef05 | 110 | #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ |
1da177e4 LT |
111 | struct object_info { |
112 | __u32 parent_id; /* parent object id */ | |
5ed70bb4 | 113 | __u32 indaddr; /* indirect disc addr */ |
1da177e4 LT |
114 | __u32 loadaddr; /* load address */ |
115 | __u32 execaddr; /* execution address */ | |
116 | __u32 size; /* size */ | |
117 | __u8 attr; /* RISC OS attributes */ | |
da23ef05 | 118 | unsigned int name_len; /* name length */ |
1da177e4 LT |
119 | char name[ADFS_MAX_NAME_LEN];/* file name */ |
120 | }; | |
121 | ||
122 | struct adfs_dir_ops { | |
5ed70bb4 RK |
123 | int (*read)(struct super_block *sb, unsigned int indaddr, |
124 | unsigned int size, struct adfs_dir *dir); | |
1da177e4 LT |
125 | int (*setpos)(struct adfs_dir *dir, unsigned int fpos); |
126 | int (*getnext)(struct adfs_dir *dir, struct object_info *obj); | |
127 | int (*update)(struct adfs_dir *dir, struct object_info *obj); | |
128 | int (*create)(struct adfs_dir *dir, struct object_info *obj); | |
129 | int (*remove)(struct adfs_dir *dir, struct object_info *obj); | |
ffdc9064 | 130 | int (*sync)(struct adfs_dir *dir); |
1da177e4 LT |
131 | void (*free)(struct adfs_dir *dir); |
132 | }; | |
133 | ||
134 | struct adfs_discmap { | |
135 | struct buffer_head *dm_bh; | |
136 | __u32 dm_startblk; | |
137 | unsigned int dm_startbit; | |
138 | unsigned int dm_endbit; | |
139 | }; | |
140 | ||
141 | /* Inode stuff */ | |
142 | struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); | |
a9185b41 | 143 | int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); |
1da177e4 LT |
144 | int adfs_notify_change(struct dentry *dentry, struct iattr *attr); |
145 | ||
146 | /* map.c */ | |
5ed70bb4 | 147 | int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset); |
1da177e4 LT |
148 | extern unsigned int adfs_map_free(struct super_block *sb); |
149 | ||
150 | /* Misc */ | |
19bdd41a | 151 | __printf(3, 4) |
1da177e4 LT |
152 | void __adfs_error(struct super_block *sb, const char *function, |
153 | const char *fmt, ...); | |
8e24eea7 | 154 | #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) |
ceb3b106 | 155 | void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...); |
1da177e4 LT |
156 | |
157 | /* super.c */ | |
158 | ||
159 | /* | |
160 | * Inodes and file operations | |
161 | */ | |
162 | ||
163 | /* dir_*.c */ | |
754661f1 | 164 | extern const struct inode_operations adfs_dir_inode_operations; |
4b6f5d20 | 165 | extern const struct file_operations adfs_dir_operations; |
e16404ed | 166 | extern const struct dentry_operations adfs_dentry_operations; |
0125f504 JL |
167 | extern const struct adfs_dir_ops adfs_f_dir_ops; |
168 | extern const struct adfs_dir_ops adfs_fplus_dir_ops; | |
1da177e4 | 169 | |
411c49bc | 170 | void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); |
ffdc9064 AV |
171 | extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, |
172 | int wait); | |
1da177e4 LT |
173 | |
174 | /* file.c */ | |
754661f1 | 175 | extern const struct inode_operations adfs_file_inode_operations; |
4b6f5d20 | 176 | extern const struct file_operations adfs_file_operations; |
1da177e4 | 177 | |
e0c93142 | 178 | static inline __u32 signed_asl(__u32 val, signed int shift) |
1da177e4 LT |
179 | { |
180 | if (shift >= 0) | |
181 | val <<= shift; | |
182 | else | |
183 | val >>= -shift; | |
184 | return val; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Calculate the address of a block in an object given the block offset | |
189 | * and the object identity. | |
190 | * | |
191 | * The root directory ID should always be looked up in the map [3.4] | |
192 | */ | |
5ed70bb4 RK |
193 | static inline int __adfs_block_map(struct super_block *sb, u32 indaddr, |
194 | unsigned int block) | |
1da177e4 | 195 | { |
5ed70bb4 | 196 | if (indaddr & 255) { |
1da177e4 LT |
197 | unsigned int off; |
198 | ||
5ed70bb4 | 199 | off = (indaddr & 255) - 1; |
1da177e4 LT |
200 | block += off << ADFS_SB(sb)->s_log2sharesize; |
201 | } | |
202 | ||
5ed70bb4 | 203 | return adfs_map_lookup(sb, indaddr >> 8, block); |
1da177e4 | 204 | } |
1dfdfc94 RK |
205 | |
206 | /* Return the disc record from the map */ | |
207 | static inline | |
208 | struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm) | |
209 | { | |
210 | return (void *)(dm[0].dm_bh->b_data + 4); | |
211 | } | |
275f5b99 RK |
212 | |
213 | static inline u64 adfs_disc_size(const struct adfs_discrecord *dr) | |
214 | { | |
215 | return (u64)le32_to_cpu(dr->disc_size_high) << 32 | | |
216 | le32_to_cpu(dr->disc_size); | |
217 | } |