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#ifndef _LINUX_PIPE_FS_I_H #define _LINUX_PIPE_FS_I_H #define PIPEFS_MAGIC 0x50495045 struct pipe_inode_info { wait_queue_head_t wait; char *base; unsigned int start; unsigned int readers; unsigned int writers; unsigned int waiting_readers; unsigned int waiting_writers; unsigned int r_counter; unsigned int w_counter; }; /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual memory allocation, whereas PIPE_BUF makes atomicity guarantees. */ #define PIPE_SIZE PAGE_SIZE #define PIPE_SEM(inode) (&(inode).i_sem) #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_READERS(inode) ((inode).i_pipe->readers) #define PIPE_WRITERS(inode) ((inode).i_pipe->writers) #define PIPE_WAITING_READERS(inode) ((inode).i_pipe->waiting_readers) #define PIPE_WAITING_WRITERS(inode) ((inode).i_pipe->waiting_writers) #define PIPE_RCOUNTER(inode) ((inode).i_pipe->r_counter) #define PIPE_WCOUNTER(inode) ((inode).i_pipe->w_counter) #define PIPE_EMPTY(inode) (PIPE_LEN(inode) == 0) #define PIPE_FULL(inode) (PIPE_LEN(inode) == PIPE_SIZE) #define PIPE_FREE(inode) (PIPE_SIZE - PIPE_LEN(inode)) #define PIPE_END(inode) ((PIPE_START(inode) + PIPE_LEN(inode)) & (PIPE_SIZE-1)) #define PIPE_MAX_RCHUNK(inode) (PIPE_SIZE - PIPE_START(inode)) #define PIPE_MAX_WCHUNK(inode) (PIPE_SIZE - PIPE_END(inode)) /* Drop the inode semaphore and wait for a pipe event, atomically */ void pipe_wait(struct inode * inode); struct inode* pipe_new(struct inode* inode); #endif
