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struct file {
#ifdef LAB_NET
enum { FD_NONE, FD_PIPE, FD_INODE, FD_DEVICE, FD_SOCK } type;
#else
enum { FD_NONE, FD_PIPE, FD_INODE, FD_DEVICE } type;
#endif
int ref; // reference count
char readable;
char writable;
struct pipe *pipe; // FD_PIPE
struct inode *ip; // FD_INODE and FD_DEVICE
#ifdef LAB_NET
struct sock *sock; // FD_SOCK
#endif
uint off; // FD_INODE
short major; // FD_DEVICE
};
#define major(dev) ((dev) >> 16 & 0xFFFF)
#define minor(dev) ((dev) & 0xFFFF)
#define mkdev(m,n) ((uint)((m)<<16| (n)))
// in-memory copy of an inode
struct inode {
uint dev; // Device number
uint inum; // Inode number
int ref; // Reference count
struct sleeplock lock; // protects everything below here
int valid; // inode has been read from disk?
short type; // copy of disk inode
short major;
short minor;
short nlink;
uint size;
uint addrs[NDIRECT+2];
};
// map major device number to device functions.
struct devsw {
int (*read)(int, uint64, int);
int (*write)(int, uint64, int);
};
extern struct devsw devsw[];
#define CONSOLE 1
#define STATS 2
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