#ifndef _LINUX_PIPE_FS_I_H
#define _LINUX_PIPE_FS_I_H

#define PIPE_DEF_BUFFERS	16

#define PIPE_BUF_FLAG_LRU	0x01	
#define PIPE_BUF_FLAG_ATOMIC	0x02	
#define PIPE_BUF_FLAG_GIFT	0x04	
#define PIPE_BUF_FLAG_PACKET	0x08	

struct pipe_buffer {
	struct page *page;
	unsigned int offset, len;
	const struct pipe_buf_operations *ops;
	unsigned int flags;
	unsigned long private;
};

struct pipe_inode_info {
	wait_queue_head_t wait;
	unsigned int nrbufs, curbuf, buffers;
	unsigned int readers;
	unsigned int writers;
	unsigned int waiting_writers;
	unsigned int r_counter;
	unsigned int w_counter;
	struct page *tmp_page;
	struct fasync_struct *fasync_readers;
	struct fasync_struct *fasync_writers;
	struct inode *inode;
	struct pipe_buffer *bufs;
};

struct pipe_buf_operations {
	int can_merge;

	void * (*map)(struct pipe_inode_info *, struct pipe_buffer *, int);

	void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *, void *);

	int (*confirm)(struct pipe_inode_info *, struct pipe_buffer *);

	void (*release)(struct pipe_inode_info *, struct pipe_buffer *);

	int (*steal)(struct pipe_inode_info *, struct pipe_buffer *);

	void (*get)(struct pipe_inode_info *, struct pipe_buffer *);
};

#define PIPE_SIZE		PAGE_SIZE

void pipe_lock(struct pipe_inode_info *);
void pipe_unlock(struct pipe_inode_info *);
void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *);

extern unsigned int pipe_max_size, pipe_min_size;
int pipe_proc_fn(struct ctl_table *, int, void __user *, size_t *, loff_t *);


void pipe_wait(struct pipe_inode_info *pipe);

struct pipe_inode_info * alloc_pipe_info(struct inode * inode);
void free_pipe_info(struct inode * inode);
void __free_pipe_info(struct pipe_inode_info *);

void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *, int);
void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *, void *);
void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_confirm(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);
void generic_pipe_buf_release(struct pipe_inode_info *, struct pipe_buffer *);

long pipe_fcntl(struct file *, unsigned int, unsigned long arg);
struct pipe_inode_info *get_pipe_info(struct file *file);

#endif