adfs.h
上传用户:lgb322
上传日期:2013-02-24
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文件大小:4k
- /* Internal data structures for ADFS */
- #define ADFS_FREE_FRAG 0
- #define ADFS_BAD_FRAG 1
- #define ADFS_ROOT_FRAG 2
- #define ADFS_NDA_OWNER_READ (1 << 0)
- #define ADFS_NDA_OWNER_WRITE (1 << 1)
- #define ADFS_NDA_LOCKED (1 << 2)
- #define ADFS_NDA_DIRECTORY (1 << 3)
- #define ADFS_NDA_EXECUTE (1 << 4)
- #define ADFS_NDA_PUBLIC_READ (1 << 5)
- #define ADFS_NDA_PUBLIC_WRITE (1 << 6)
- #include "dir_f.h"
- /*
- * Directory handling
- */
- struct adfs_dir {
- struct super_block *sb;
- int nr_buffers;
- struct buffer_head *bh[4];
- unsigned int pos;
- unsigned int parent_id;
- struct adfs_dirheader dirhead;
- union adfs_dirtail dirtail;
- };
- /*
- * This is the overall maximum name length
- */
- #define ADFS_MAX_NAME_LEN 256
- struct object_info {
- __u32 parent_id; /* parent object id */
- __u32 file_id; /* object id */
- __u32 loadaddr; /* load address */
- __u32 execaddr; /* execution address */
- __u32 size; /* size */
- __u8 attr; /* RISC OS attributes */
- unsigned char name_len; /* name length */
- char name[ADFS_MAX_NAME_LEN];/* file name */
- };
- struct adfs_dir_ops {
- int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
- int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
- int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
- int (*update)(struct adfs_dir *dir, struct object_info *obj);
- int (*create)(struct adfs_dir *dir, struct object_info *obj);
- int (*remove)(struct adfs_dir *dir, struct object_info *obj);
- void (*free)(struct adfs_dir *dir);
- };
- struct adfs_discmap {
- struct buffer_head *dm_bh;
- __u32 dm_startblk;
- unsigned int dm_startbit;
- unsigned int dm_endbit;
- };
- /* dir stuff */
- /* Inode stuff */
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0)
- int adfs_get_block(struct inode *inode, long block,
- struct buffer_head *bh, int create);
- #else
- int adfs_bmap(struct inode *inode, int block);
- #endif
- struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
- void adfs_read_inode(struct inode *inode);
- void adfs_write_inode(struct inode *inode,int unused);
- int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
- /* map.c */
- extern int adfs_map_lookup(struct super_block *sb, int frag_id, int offset);
- extern unsigned int adfs_map_free(struct super_block *sb);
- /* Misc */
- void __adfs_error(struct super_block *sb, const char *function,
- const char *fmt, ...);
- #define adfs_error(sb, fmt...) __adfs_error(sb, __FUNCTION__, fmt)
- /* namei.c */
- extern struct dentry *adfs_lookup(struct inode *dir, struct dentry *dentry);
- /* super.c */
- /*
- * Inodes and file operations
- */
- /* dir_*.c */
- extern struct inode_operations adfs_dir_inode_operations;
- extern struct file_operations adfs_dir_operations;
- extern struct dentry_operations adfs_dentry_operations;
- extern struct adfs_dir_ops adfs_f_dir_ops;
- extern struct adfs_dir_ops adfs_fplus_dir_ops;
- extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
- /* file.c */
- extern struct inode_operations adfs_file_inode_operations;
- extern struct file_operations adfs_file_operations;
- extern inline __u32 signed_asl(__u32 val, signed int shift)
- {
- if (shift >= 0)
- val <<= shift;
- else
- val >>= -shift;
- return val;
- }
- /*
- * Calculate the address of a block in an object given the block offset
- * and the object identity.
- *
- * The root directory ID should always be looked up in the map [3.4]
- */
- extern inline int
- __adfs_block_map(struct super_block *sb, unsigned int object_id,
- unsigned int block)
- {
- if (object_id & 255) {
- unsigned int off;
- off = (object_id & 255) - 1;
- block += off << sb->u.adfs_sb.s_log2sharesize;
- }
- return adfs_map_lookup(sb, object_id >> 8, block);
- }