/fs/adfs/adfs.h

  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	struct adfs_discmap *s_map;	/* bh list containing map		 */
 47	struct adfs_dir_ops *s_dir;	/* directory operations			 */
 48
 49	uid_t		s_uid;		/* owner uid				 */
 50	gid_t		s_gid;		/* owner gid				 */
 51	umode_t		s_owner_mask;	/* ADFS owner perm -> unix perm		 */
 52	umode_t		s_other_mask;	/* ADFS other perm -> unix perm		 */
 53	int		s_ftsuffix;	/* ,xyz hex filetype suffix option */
 54
 55	__u32		s_ids_per_zone;	/* max. no ids in one zone		 */
 56	__u32		s_idlen;	/* length of ID in map			 */
 57	__u32		s_map_size;	/* sector size of a map			 */
 58	unsigned long	s_size;		/* total size (in blocks) of this fs	 */
 59	signed int	s_map2blk;	/* shift left by this for map->sector	 */
 60	unsigned int	s_log2sharesize;/* log2 share size			 */
 61	__le32		s_version;	/* disc format version			 */
 62	unsigned int	s_namelen;	/* maximum number of characters in name	 */
 63};
 64
 65static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
 66{
 67	return sb->s_fs_info;
 68}
 69
 70static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
 71{
 72	return container_of(inode, struct adfs_inode_info, vfs_inode);
 73}
 74
 75/*
 76 * Directory handling
 77 */
 78struct adfs_dir {
 79	struct super_block	*sb;
 80
 81	int			nr_buffers;
 82	struct buffer_head	*bh[4];
 83
 84	/* big directories need allocated buffers */
 85	struct buffer_head	**bh_fplus;
 86
 87	unsigned int		pos;
 88	unsigned int		parent_id;
 89
 90	struct adfs_dirheader	dirhead;
 91	union  adfs_dirtail	dirtail;
 92};
 93
 94/*
 95 * This is the overall maximum name length
 96 */
 97#define ADFS_MAX_NAME_LEN	(256 + 4) /* +4 for ,xyz hex filetype suffix */
 98struct object_info {
 99	__u32		parent_id;		/* parent object id	*/
100	__u32		file_id;		/* object id		*/
101	__u32		loadaddr;		/* load address		*/
102	__u32		execaddr;		/* execution address	*/
103	__u32		size;			/* size			*/
104	__u8		attr;			/* RISC OS attributes	*/
105	unsigned int	name_len;		/* name length		*/
106	char		name[ADFS_MAX_NAME_LEN];/* file name		*/
107
108	/* RISC OS file type (12-bit: derived from loadaddr) */
109	__u16		filetype;
110};
111
112/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
113static inline int append_filetype_suffix(char *buf, __u16 filetype)
114{
115	if (filetype == 0xffff)	/* no explicit 12-bit file type was set */
116		return 0;
117
118	*buf++ = ',';
119	*buf++ = hex_asc_lo(filetype >> 8);
120	*buf++ = hex_asc_lo(filetype >> 4);
121	*buf++ = hex_asc_lo(filetype >> 0);
122	return 4;
123}
124
125struct adfs_dir_ops {
126	int	(*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
127	int	(*setpos)(struct adfs_dir *dir, unsigned int fpos);
128	int	(*getnext)(struct adfs_dir *dir, struct object_info *obj);
129	int	(*update)(struct adfs_dir *dir, struct object_info *obj);
130	int	(*create)(struct adfs_dir *dir, struct object_info *obj);
131	int	(*remove)(struct adfs_dir *dir, struct object_info *obj);
132	int	(*sync)(struct adfs_dir *dir);
133	void	(*free)(struct adfs_dir *dir);
134};
135
136struct adfs_discmap {
137	struct buffer_head	*dm_bh;
138	__u32			dm_startblk;
139	unsigned int		dm_startbit;
140	unsigned int		dm_endbit;
141};
142
143/* Inode stuff */
144struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
145int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
146int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
147
148/* map.c */
149extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
150extern unsigned int adfs_map_free(struct super_block *sb);
151
152/* Misc */
153void __adfs_error(struct super_block *sb, const char *function,
154		  const char *fmt, ...);
155#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, 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 struct adfs_dir_ops adfs_f_dir_ops;
168extern struct adfs_dir_ops adfs_fplus_dir_ops;
169
170extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
171			   int wait);
172
173/* file.c */
174extern const struct inode_operations adfs_file_inode_operations;
175extern const struct file_operations adfs_file_operations;
176
177static inline __u32 signed_asl(__u32 val, signed int shift)
178{
179	if (shift >= 0)
180		val <<= shift;
181	else
182		val >>= -shift;
183	return val;
184}
185
186/*
187 * Calculate the address of a block in an object given the block offset
188 * and the object identity.
189 *
190 * The root directory ID should always be looked up in the map [3.4]
191 */
192static inline int
193__adfs_block_map(struct super_block *sb, unsigned int object_id,
194		 unsigned int block)
195{
196	if (object_id & 255) {
197		unsigned int off;
198
199		off = (object_id & 255) - 1;
200		block += off << ADFS_SB(sb)->s_log2sharesize;
201	}
202
203	return adfs_map_lookup(sb, object_id >> 8, block);
204}