#ifndef _FS_PIPE_FS_H
#define _FS_PIPE_FS_H

struct pipe_inode_info {
    struct wait_queue *wait;
    char *base;
    unsigned int start;
    unsigned int len;
    unsigned int lock;
    unsigned int rd_openers;
    unsigned int wr_openers;
    unsigned int readers;
    unsigned int writers;
};

#define PIPE_WAIT(inode)  ((inode).u.pipe_i.wait)
#define PIPE_BASE(inode)  ((inode).u.pipe_i.base)
#define PIPE_START(inode) ((inode).u.pipe_i.start)
#define PIPE_LEN(inode)   ((inode).u.pipe_i.len)
#define PIPE_RD_OPENERS(inode)  ((inode).u.pipe_i.rd_openers)
#define PIPE_WR_OPENERS(inode)  ((inode).u.pipe_i.wr_openers)
#define PIPE_READERS(inode) ((inode).u.pipe_i.readers)
#define PIPE_WRITERS(inode) ((inode).u.pipe_i.writers)
#define PIPE_LOCK(inode)  ((inode).u.pipe_i.lock)
#define PIPE_SIZE(inode)  PIPE_LEN(inode)

#define PIPE_EMPTY(inode) (PIPE_SIZE(inode)==0)
#define PIPE_FULL(inode)  (PIPE_SIZE(inode)==PIPE_BUF)
#define PIPE_FREE(inode)  (PIPE_BUF - PIPE_LEN(inode))
#define PIPE_END(inode)   ((PIPE_START(inode)+PIPE_LEN(inode))&\
                 (PIPE_BUF-1))
#define PIPE_MAX_RCHUNK(inode)  (PIPE_BUF - PIPE_START(inode))
#define PIPE_MAX_WCHUNK(inode)  (PIPE_BUF - PIPE_END(inode))

#endif