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#ifndef _LINUX_PIPE_FS_I_H
#define _LINUX_PIPE_FS_I_H
struct pipe_inode_info {
struct wait_queue * read_wait;
struct wait_queue * write_wait;
char * base;
unsigned int head;
unsigned int tail;
unsigned int rd_openers;
unsigned int wr_openers;
unsigned int readers;
unsigned int writers;
};
#define PIPE_READ_WAIT(inode) ((inode).u.pipe_i.read_wait)
#define PIPE_WRITE_WAIT(inode) ((inode).u.pipe_i.write_wait)
#define PIPE_BASE(inode) ((inode).u.pipe_i.base)
#define PIPE_HEAD(inode) ((inode).u.pipe_i.head)
#define PIPE_TAIL(inode) ((inode).u.pipe_i.tail)
#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_SIZE(inode) ((PIPE_HEAD(inode)-PIPE_TAIL(inode))&(PAGE_SIZE-1))
#define PIPE_EMPTY(inode) (PIPE_HEAD(inode)==PIPE_TAIL(inode))
#define PIPE_FULL(inode) (PIPE_SIZE(inode)==(PAGE_SIZE-1))
#endif
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