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#ifndef _LINUX_PIPE_FS_I_H
#define _LINUX_PIPE_FS_I_H
struct pipe_inode_info {
wait_queue_head_t wait;
char * base;
unsigned int start;
unsigned int lock;
unsigned int rd_openers;
unsigned int wr_openers;
unsigned int readers;
unsigned int writers;
};
#define PIPE_WAIT(inode) ((inode).i_pipe->wait)
#define PIPE_BASE(inode) ((inode).i_pipe->base)
#define PIPE_START(inode) ((inode).i_pipe->start)
#define PIPE_LEN(inode) ((inode).i_size)
#define PIPE_RD_OPENERS(inode) ((inode).i_pipe->rd_openers)
#define PIPE_WR_OPENERS(inode) ((inode).i_pipe->wr_openers)
#define PIPE_READERS(inode) ((inode).i_pipe->readers)
#define PIPE_WRITERS(inode) ((inode).i_pipe->writers)
#define PIPE_LOCK(inode) ((inode).i_pipe->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
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