1 #ifndef _LINUX_PIPE_FS_I_H 2 #define _LINUX_PIPE_FS_I_H 3 4 struct pipe_inode_info { 5 struct wait_queue * read_wait; 6 struct wait_queue * write_wait; 7 char * base; 8 unsigned int head; 9 unsigned int tail; 10 unsigned int readers; 11 unsigned int writers; 12 }; 13 14 #define PIPE_READ_WAIT(inode) ((inode).u.pipe_i.read_wait) 15 #define PIPE_WRITE_WAIT(inode) ((inode).u.pipe_i.write_wait) 16 #define PIPE_BASE(inode) ((inode).u.pipe_i.base) 17 #define PIPE_HEAD(inode) ((inode).u.pipe_i.head) 18 #define PIPE_TAIL(inode) ((inode).u.pipe_i.tail) 19 #define PIPE_READERS(inode) ((inode).u.pipe_i.readers) 20 #define PIPE_WRITERS(inode) ((inode).u.pipe_i.writers) 21 #define PIPE_SIZE(inode) ((PIPE_HEAD(inode)-PIPE_TAIL(inode))&(PAGE_SIZE-1)) 22 #define PIPE_EMPTY(inode) (PIPE_HEAD(inode)==PIPE_TAIL(inode)) 23 #define PIPE_FULL(inode) (PIPE_SIZE(inode)==(PAGE_SIZE-1)) 24 25 #endif