file.h

struct file {
    enum {
        FD_NONE, FD_PIPE, FD_INODE
    } type;
    int ref; // reference count
    char readable;
    char writable;
    struct pipe *pipe;
    struct inode *ip;
    uint off;
};


// in-memory copy of an inode
struct inode {
    uint dev;           // Device number
    uint inum;          // Inode number
    int ref;            // Reference count
    int flags;          // I_BUSY, I_VALID

    short type;         // copy of disk inode
    short major;
    short minor;
    short nlink;
    uint size;
    uint addrs[NDIRECT + 1];
};
#define I_BUSY 0x1
#define I_VALID 0x2

// table mapping major device number to
// device functions
struct devsw {
    int (*read)(struct inode *, char *, int);

    int (*write)(struct inode *, char *, int);
};

extern struct devsw devsw[];

#define CONSOLE 1

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