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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] */
15static 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#include "dir_f.h"
30
31/*
32 * adfs file system inode data in memory
33 */
34struct adfs_inode_info {
35 loff_t mmu_private;
36 __u32 parent_id; /* parent indirect disc address */
37 __u32 loadaddr; /* RISC OS load address */
38 __u32 execaddr; /* RISC OS exec address */
39 unsigned int attr; /* RISC OS permissions */
40 struct inode vfs_inode;
41};
42
43static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
44{
45 return container_of(inode, struct adfs_inode_info, vfs_inode);
46}
47
48static inline bool adfs_inode_is_stamped(struct inode *inode)
49{
50 return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000;
51}
52
53/*
54 * Forward-declare this
55 */
56struct adfs_discmap;
57struct adfs_dir_ops;
58
59/*
60 * ADFS file system superblock data in memory
61 */
62struct adfs_sb_info {
63 union { struct {
64 struct adfs_discmap *s_map; /* bh list containing map */
65 const struct adfs_dir_ops *s_dir; /* directory operations */
66 };
67 struct rcu_head rcu; /* used only at shutdown time */
68 };
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 */
73 int s_ftsuffix; /* ,xyz hex filetype suffix option */
74
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 */
78 signed int s_map2blk; /* shift left by this for map->sector*/
79 unsigned int s_log2sharesize;/* log2 share size */
80 unsigned int s_namelen; /* maximum number of characters in name */
81};
82
83static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
84{
85 return sb->s_fs_info;
86}
87
88/*
89 * Directory handling
90 */
91struct adfs_dir {
92 struct super_block *sb;
93
94 int nr_buffers;
95 struct buffer_head *bh[4];
96
97 /* big directories need allocated buffers */
98 struct buffer_head **bh_fplus;
99
100 unsigned int pos;
101 __u32 parent_id;
102
103 struct adfs_dirheader dirhead;
104 union adfs_dirtail dirtail;
105};
106
107/*
108 * This is the overall maximum name length
109 */
110#define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
111struct object_info {
112 __u32 parent_id; /* parent object id */
113 __u32 indaddr; /* indirect disc addr */
114 __u32 loadaddr; /* load address */
115 __u32 execaddr; /* execution address */
116 __u32 size; /* size */
117 __u8 attr; /* RISC OS attributes */
118 unsigned int name_len; /* name length */
119 char name[ADFS_MAX_NAME_LEN];/* file name */
120};
121
122struct adfs_dir_ops {
123 int (*read)(struct super_block *sb, unsigned int indaddr,
124 unsigned int size, struct adfs_dir *dir);
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);
130 int (*sync)(struct adfs_dir *dir);
131 void (*free)(struct adfs_dir *dir);
132};
133
134struct 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 */
142struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
143int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
144int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
145
146/* map.c */
147int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);
148extern unsigned int adfs_map_free(struct super_block *sb);
149
150/* Misc */
151__printf(3, 4)
152void __adfs_error(struct super_block *sb, const char *function,
153 const char *fmt, ...);
154#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
155void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...);
156
157/* super.c */
158
159/*
160 * Inodes and file operations
161 */
162
163/* dir_*.c */
164extern const struct inode_operations adfs_dir_inode_operations;
165extern const struct file_operations adfs_dir_operations;
166extern const struct dentry_operations adfs_dentry_operations;
167extern const struct adfs_dir_ops adfs_f_dir_ops;
168extern const struct adfs_dir_ops adfs_fplus_dir_ops;
169
170void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
171extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
172 int wait);
173
174/* file.c */
175extern const struct inode_operations adfs_file_inode_operations;
176extern const struct file_operations adfs_file_operations;
177
178static inline __u32 signed_asl(__u32 val, signed int shift)
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 */
193static inline int __adfs_block_map(struct super_block *sb, u32 indaddr,
194 unsigned int block)
195{
196 if (indaddr & 255) {
197 unsigned int off;
198
199 off = (indaddr & 255) - 1;
200 block += off << ADFS_SB(sb)->s_log2sharesize;
201 }
202
203 return adfs_map_lookup(sb, indaddr >> 8, block);
204}
205
206/* Return the disc record from the map */
207static inline
208struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm)
209{
210 return (void *)(dm[0].dm_bh->b_data + 4);
211}
212
213static 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}
1#include <linux/fs.h>
2#include <linux/adfs_fs.h>
3
4/* Internal data structures for ADFS */
5
6#define ADFS_FREE_FRAG 0
7#define ADFS_BAD_FRAG 1
8#define ADFS_ROOT_FRAG 2
9
10#define ADFS_NDA_OWNER_READ (1 << 0)
11#define ADFS_NDA_OWNER_WRITE (1 << 1)
12#define ADFS_NDA_LOCKED (1 << 2)
13#define ADFS_NDA_DIRECTORY (1 << 3)
14#define ADFS_NDA_EXECUTE (1 << 4)
15#define ADFS_NDA_PUBLIC_READ (1 << 5)
16#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
17
18#include "dir_f.h"
19
20struct buffer_head;
21
22/*
23 * adfs file system inode data in memory
24 */
25struct adfs_inode_info {
26 loff_t mmu_private;
27 unsigned long parent_id; /* object id of parent */
28 __u32 loadaddr; /* RISC OS load address */
29 __u32 execaddr; /* RISC OS exec address */
30 unsigned int filetype; /* RISC OS file type */
31 unsigned int attr; /* RISC OS permissions */
32 unsigned int stamped:1; /* RISC OS file has date/time */
33 struct inode vfs_inode;
34};
35
36/*
37 * Forward-declare this
38 */
39struct adfs_discmap;
40struct adfs_dir_ops;
41
42/*
43 * ADFS file system superblock data in memory
44 */
45struct adfs_sb_info {
46 union { struct {
47 struct adfs_discmap *s_map; /* bh list containing map */
48 const struct adfs_dir_ops *s_dir; /* directory operations */
49 };
50 struct rcu_head rcu; /* used only at shutdown time */
51 };
52 kuid_t s_uid; /* owner uid */
53 kgid_t s_gid; /* owner gid */
54 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
55 umode_t s_other_mask; /* ADFS other perm -> unix perm */
56 int s_ftsuffix; /* ,xyz hex filetype suffix option */
57
58 __u32 s_ids_per_zone; /* max. no ids in one zone */
59 __u32 s_idlen; /* length of ID in map */
60 __u32 s_map_size; /* sector size of a map */
61 unsigned long s_size; /* total size (in blocks) of this fs */
62 signed int s_map2blk; /* shift left by this for map->sector*/
63 unsigned int s_log2sharesize;/* log2 share size */
64 __le32 s_version; /* disc format version */
65 unsigned int s_namelen; /* maximum number of characters in name */
66};
67
68static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
69{
70 return sb->s_fs_info;
71}
72
73static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
74{
75 return container_of(inode, struct adfs_inode_info, vfs_inode);
76}
77
78/*
79 * Directory handling
80 */
81struct adfs_dir {
82 struct super_block *sb;
83
84 int nr_buffers;
85 struct buffer_head *bh[4];
86
87 /* big directories need allocated buffers */
88 struct buffer_head **bh_fplus;
89
90 unsigned int pos;
91 unsigned int parent_id;
92
93 struct adfs_dirheader dirhead;
94 union adfs_dirtail dirtail;
95};
96
97/*
98 * This is the overall maximum name length
99 */
100#define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
101struct object_info {
102 __u32 parent_id; /* parent object id */
103 __u32 file_id; /* object id */
104 __u32 loadaddr; /* load address */
105 __u32 execaddr; /* execution address */
106 __u32 size; /* size */
107 __u8 attr; /* RISC OS attributes */
108 unsigned int name_len; /* name length */
109 char name[ADFS_MAX_NAME_LEN];/* file name */
110
111 /* RISC OS file type (12-bit: derived from loadaddr) */
112 __u16 filetype;
113};
114
115/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
116static inline int append_filetype_suffix(char *buf, __u16 filetype)
117{
118 if (filetype == 0xffff) /* no explicit 12-bit file type was set */
119 return 0;
120
121 *buf++ = ',';
122 *buf++ = hex_asc_lo(filetype >> 8);
123 *buf++ = hex_asc_lo(filetype >> 4);
124 *buf++ = hex_asc_lo(filetype >> 0);
125 return 4;
126}
127
128struct adfs_dir_ops {
129 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
130 int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
131 int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
132 int (*update)(struct adfs_dir *dir, struct object_info *obj);
133 int (*create)(struct adfs_dir *dir, struct object_info *obj);
134 int (*remove)(struct adfs_dir *dir, struct object_info *obj);
135 int (*sync)(struct adfs_dir *dir);
136 void (*free)(struct adfs_dir *dir);
137};
138
139struct adfs_discmap {
140 struct buffer_head *dm_bh;
141 __u32 dm_startblk;
142 unsigned int dm_startbit;
143 unsigned int dm_endbit;
144};
145
146/* Inode stuff */
147struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
148int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
149int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
150
151/* map.c */
152extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
153extern unsigned int adfs_map_free(struct super_block *sb);
154
155/* Misc */
156__printf(3, 4)
157void __adfs_error(struct super_block *sb, const char *function,
158 const char *fmt, ...);
159#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
160
161/* super.c */
162
163/*
164 * Inodes and file operations
165 */
166
167/* dir_*.c */
168extern const struct inode_operations adfs_dir_inode_operations;
169extern const struct file_operations adfs_dir_operations;
170extern const struct dentry_operations adfs_dentry_operations;
171extern const struct adfs_dir_ops adfs_f_dir_ops;
172extern const struct adfs_dir_ops adfs_fplus_dir_ops;
173
174extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
175 int wait);
176
177/* file.c */
178extern const struct inode_operations adfs_file_inode_operations;
179extern const struct file_operations adfs_file_operations;
180
181static inline __u32 signed_asl(__u32 val, signed int shift)
182{
183 if (shift >= 0)
184 val <<= shift;
185 else
186 val >>= -shift;
187 return val;
188}
189
190/*
191 * Calculate the address of a block in an object given the block offset
192 * and the object identity.
193 *
194 * The root directory ID should always be looked up in the map [3.4]
195 */
196static inline int
197__adfs_block_map(struct super_block *sb, unsigned int object_id,
198 unsigned int block)
199{
200 if (object_id & 255) {
201 unsigned int off;
202
203 off = (object_id & 255) - 1;
204 block += off << ADFS_SB(sb)->s_log2sharesize;
205 }
206
207 return adfs_map_lookup(sb, object_id >> 8, block);
208}