You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
2.7 KiB
88 lines
2.7 KiB
2 years ago
|
#ifndef _RFS_H_
|
||
|
|
#define _RFS_H_
|
||
|
|
|
||
|
|
#include "ramdev.h"
|
||
|
|
#include "riscv.h"
|
||
|
|
#include "util/types.h"
|
||
|
|
#include "vfs.h"
|
||
|
|
|
||
|
|
#define RFS_TYPE 0
|
||
|
|
#define RFS_MAGIC 0xBEAF
|
||
|
|
#define RFS_BLKSIZE PGSIZE
|
||
|
|
#define RFS_INODESIZE 128 // block size must be divisible by this value
|
||
|
|
#define RFS_MAX_INODE_BLKNUM 10
|
||
|
|
#define RFS_MAX_FILE_NAME_LEN 28
|
||
|
|
#define RFS_DIRECT_BLKNUM DIRECT_BLKNUM
|
||
|
|
|
||
|
|
// rfs block offset
|
||
|
|
#define RFS_BLK_OFFSET_SUPER 0
|
||
|
|
#define RFS_BLK_OFFSET_INODE 1
|
||
|
|
#define RFS_BLK_OFFSET_BITMAP 11
|
||
|
|
#define RFS_BLK_OFFSET_FREE 12
|
||
|
|
|
||
|
|
// dinode type
|
||
|
|
#define R_FILE FILE_I
|
||
|
|
#define R_DIR DIR_I
|
||
|
|
#define R_FREE 2
|
||
|
|
|
||
|
|
// file system super block
|
||
|
|
struct rfs_superblock {
|
||
|
|
int magic; // magic number of the
|
||
|
|
int size; // size of file system image (blocks)
|
||
|
|
int nblocks; // number of data blocks
|
||
|
|
int ninodes; // number of inodes.
|
||
|
|
};
|
||
|
|
|
||
|
|
// disk inode
|
||
|
|
struct rfs_dinode {
|
||
|
|
int size; // size of the file (in bytes)
|
||
|
|
int type; // one of R_FREE, R_FILE, R_DIR
|
||
|
|
int nlinks; // number of hard links to this file
|
||
|
|
int blocks; // number of blocks
|
||
|
|
int addrs[RFS_DIRECT_BLKNUM]; // direct blocks
|
||
|
|
};
|
||
|
|
|
||
|
|
// directory entry
|
||
|
|
struct rfs_direntry {
|
||
|
|
int inum; // inode number
|
||
|
|
char name[RFS_MAX_FILE_NAME_LEN]; // file name
|
||
|
|
};
|
||
|
|
|
||
|
|
// directory memory cache (used by opendir/readdir/closedir)
|
||
|
|
struct rfs_dir_cache {
|
||
|
|
int block_count;
|
||
|
|
struct rfs_direntry *dir_base_addr;
|
||
|
|
};
|
||
|
|
|
||
|
|
// rfs utility functin declarations
|
||
|
|
int register_rfs();
|
||
|
|
int rfs_format_dev(struct device *dev);
|
||
|
|
|
||
|
|
int rfs_r1block(struct rfs_device *rfs_dev, int n_block);
|
||
|
|
int rfs_w1block(struct rfs_device *rfs_dev, int n_block);
|
||
|
|
struct rfs_dinode *rfs_read_dinode(struct rfs_device *rdev, int n_inode);
|
||
|
|
int rfs_write_dinode(struct rfs_device *rdev, const struct rfs_dinode *dinode,
|
||
|
|
int n_inode);
|
||
|
|
int rfs_alloc_block(struct super_block *sb);
|
||
|
|
int rfs_free_block(struct super_block *sb, int block_num);
|
||
|
|
int rfs_add_direntry(struct vinode *dir, const char *name, int inum);
|
||
|
|
|
||
|
|
struct vinode *rfs_alloc_vinode(struct super_block *sb);
|
||
|
|
int rfs_write_back_vinode(struct vinode *vinode);
|
||
|
|
int rfs_update_vinode(struct vinode *vinode);
|
||
|
|
|
||
|
|
// rfs interface function declarations
|
||
|
|
ssize_t rfs_read(struct vinode *f_inode, char *r_buf, ssize_t len, int *offset);
|
||
|
|
ssize_t rfs_write(struct vinode *f_inode, const char *w_buf, ssize_t len,
|
||
|
|
int *offset);
|
||
|
|
struct vinode *rfs_lookup(struct vinode *parent, struct dentry *sub_dentry);
|
||
|
|
struct vinode *rfs_create(struct vinode *parent, struct dentry *sub_dentry);
|
||
|
|
int rfs_lseek(struct vinode *f_inode, ssize_t new_offset, int whence, int *offset);
|
||
|
|
int rfs_disk_stat(struct vinode *vinode, struct istat *istat);
|
||
|
|
|
||
|
|
struct super_block *rfs_get_superblock(struct device *dev);
|
||
|
|
|
||
|
|
extern const struct vinode_ops rfs_i_ops;
|
||
|
|
|
||
|
|
#endif
|