1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/fs.h>
3 #include <linux/adfs_fs.h>
4
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
19 #include "dir_f.h"
20
21 struct buffer_head;
22
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 {
47 union { struct {
48 struct adfs_discmap *s_map; /* bh list containing map */
49 const struct adfs_dir_ops *s_dir; /* directory operations */
50 };
51 struct rcu_head rcu; /* used only at shutdown time */
52 };
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 */
57 int s_ftsuffix; /* ,xyz hex filetype suffix option */
58
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 */
66 unsigned int s_namelen; /* maximum number of characters in name */
67 };
68
ADFS_SB(struct super_block * sb)69 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
70 {
71 return sb->s_fs_info;
72 }
73
ADFS_I(struct inode * inode)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
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];
87
88 /* big directories need allocated buffers */
89 struct buffer_head **bh_fplus;
90
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 */
101 #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
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 */
109 unsigned int name_len; /* name length */
110 char name[ADFS_MAX_NAME_LEN];/* file name */
111
112 /* RISC OS file type (12-bit: derived from loadaddr) */
113 __u16 filetype;
114 };
115
116 /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
append_filetype_suffix(char * buf,__u16 filetype)117 static inline int append_filetype_suffix(char *buf, __u16 filetype)
118 {
119 if (filetype == 0xffff) /* no explicit 12-bit file type was set */
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
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);
136 int (*sync)(struct adfs_dir *dir);
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);
149 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
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 */
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
162 /* super.c */
163
164 /*
165 * Inodes and file operations
166 */
167
168 /* dir_*.c */
169 extern const struct inode_operations adfs_dir_inode_operations;
170 extern const struct file_operations adfs_dir_operations;
171 extern const struct dentry_operations adfs_dentry_operations;
172 extern const struct adfs_dir_ops adfs_f_dir_ops;
173 extern const struct adfs_dir_ops adfs_fplus_dir_ops;
174
175 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
176 int wait);
177
178 /* file.c */
179 extern const struct inode_operations adfs_file_inode_operations;
180 extern const struct file_operations adfs_file_operations;
181
signed_asl(__u32 val,signed int shift)182 static inline __u32 signed_asl(__u32 val, signed int shift)
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 */
197 static inline int
__adfs_block_map(struct super_block * sb,unsigned int object_id,unsigned int block)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 }
210