vfs.h

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struct nctx {
        off_t offset; 
        void *priv; 
};

enum ntype {
        NINFO_TYPE_UNKNOWN, 
        NINFO_TYPE_FOLDER, 
        NINFO_TYPE_FILE, 
        NINFO_TYPE_DEVICE, 
};

struct ninfo;

struct entry {
        struct object object;
        int mode; 
        struct ninfo *ninfo; 
        struct nctx nctx; 
};

#define MAJOR(id)       ((id) >> 8)

#define MINOR(id)       ((id) & 0xFF)

struct ninfo_dev {
        dev_t device;
};

struct ninfo_ops {
        int (*open)(struct ninfo *, struct nctx *);
        int (*close)(struct ninfo *, struct nctx *);
        int (*read)(struct ninfo *, struct nctx *, void *, size_t);
        int (*write)(struct ninfo *, struct nctx *, const void *, size_t);
        off_t (*lseek)(struct ninfo *, struct nctx *, off_t, int);
        int (*ioctl)(struct ninfo *, struct nctx *, int, va_list);
};

struct ninfo {
        char *name; 
        enum ntype type; 
        int refcnt; 
        int deleted; 
        ino_t id;

        struct sinfo *si; 
        void *priv; 
        unsigned long size; 
        int head_sibling; 
        struct list_head sibling; 
        struct list_head child; 
        struct list_head sinfo; 
        struct ninfo_ops nops;
};

#define ROOT_NINFO 0

struct sinfo {
        struct list_head head;
        void *priv;
        int refcnt;

        struct ninfo *(*get_ninfo)(struct sinfo *this, unsigned long id);
        int (*fill_ninfo)(struct sinfo *this, struct ninfo *parent,
                        struct ninfo *ninfo, void *info);
        int (*del_ninfo)(struct sinfo *this, struct ninfo *ninfo);
        void (*refresh_children)(struct sinfo *this, struct ninfo *ninfo);
};

static inline void vfs_ninfo_ref(struct ninfo *node)
{
        node->refcnt++;
}

static inline void vfs_ninfo_unref(struct ninfo *node)
{
        node->refcnt--;
}

static inline void vfs_sinfo_ref(struct sinfo *sinfo)
{
        sinfo->refcnt++;
}

static inline void vfs_sinfo_unref(struct sinfo *sinfo)
{
        sinfo->refcnt--;
}

extern struct ninfo *vfs_get_ninfo_child(struct ninfo *node);

extern struct ninfo *vfs_get_ninfo_parent(struct ninfo *node);

extern struct ninfo *vfs_get_ninfo_next_sibling(struct ninfo *node);

extern struct ninfo *vfs_get_ninfo_prev_sibling(struct ninfo *node);

extern struct sinfo *vfs_get_last_sinfo(struct ninfo *node);

extern int vfs_init(void);

extern int vfs_attach_storage(struct ninfo *node, struct sinfo *sb);

extern int vfs_deatch_storage(struct ninfo *node);

extern struct ninfo *vfs_get_ninfo(struct sinfo *sinfo, struct ninfo *node,
                const char *path);

extern struct ninfo *vfs_new_ninfo(struct sinfo *si,
                struct ninfo *parent, const char *name, void *info);

extern int vfs_del_ninfo(struct ninfo *ninfo);

extern struct ninfo *vfs_new_dev_ninfo(struct sinfo *si, struct ninfo *parent,
                const char *name, dev_t device, struct ninfo_ops *nops);