#ifndef __FS_VFS__
#define __FS_VFS__

#include <types.h>
#include <generic.h>

#define VFS_FILENAME_MAX_LENGTH 128

#define FS_FILE        0x01
#define FS_DIRECTORY   0x02
#define FS_CHARDEVICE  0x03
#define FS_BLOCKDEVICE 0x04
#define FS_PIPE        0x05
#define FS_SYMLINK     0x06
#define FS_MOUNTPOINT  0x08

struct fs_node;

typedef u32int (*read_type_t)(struct fs_node *,
                              u32int,
                              u32int,
                              u8int *);

typedef u32int (*write_type_t)(struct fs_node *,
                              u32int,
                              u32int,
                              u8int *);

typedef void (*open_type_t)(struct fs_node *);
typedef void (*close_type_t)(struct fs_node *);

typedef struct dirent *(*readdir_type_t)(struct fs_node *,
                                         u32int);

typedef struct fs_node *(*finddir_type_t)(struct fs_node *,
                                         char *name);



typedef struct fs_node {
    char name[VFS_FILENAME_MAX_LENGTH];
    u32int mask; // permission mask
    u32int uid;
    u32int gid;
    u32int flags;
    u32int inode;
    u32int length;
    u32int impl; // impl defined number
    read_type_t read;
    write_type_t write;
    open_type_t open;
    close_type_t close;
    readdir_type_t readdir;
    finddir_type_t finddir;
    struct fs_node *ptr; // used by mountpoints and symlinks
} fs_node_t;

typedef struct dirent {
    char name[VFS_FILENAME_MAX_LENGTH];
    u32int ino;
} dirent_t;

u32int read_fs(fs_node_t *node,
               u32int offset,
               u32int size,
               u8int *buffer);

u32int write_fs(fs_node_t *node,
               u32int offset,
               u32int size,
               u8int *buffer);

void open_fs(fs_node_t *node,
             u8int read,
             u8int write);

void close_fs(fs_node_t *node);

struct dirent *readdir_fs(fs_node_t *node,
        u32int index);

fs_node_t *finddir_fs(fs_node_t *node,
                      char *name);

#endif