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		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 struct adfs_dir_ops adfs_f_dir_ops;
172extern 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}
209