Subversion Repositories or1k

#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 len;

        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_pipe->len)

#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