1 #ifndef _LINUX_PIPE_FS_I_H
2 #define _LINUX_PIPE_FS_I_H
4 #define PIPEFS_MAGIC 0x50495045
6 #define PIPE_BUFFERS (16)
10 unsigned int offset
, len
;
11 struct pipe_buf_operations
*ops
;
14 struct pipe_buf_operations
{
16 void * (*map
)(struct file
*, struct pipe_inode_info
*, struct pipe_buffer
*);
17 void (*unmap
)(struct pipe_inode_info
*, struct pipe_buffer
*);
18 void (*release
)(struct pipe_inode_info
*, struct pipe_buffer
*);
19 int (*steal
)(struct pipe_inode_info
*, struct pipe_buffer
*);
22 struct pipe_inode_info
{
23 wait_queue_head_t wait
;
24 unsigned int nrbufs
, curbuf
;
25 struct pipe_buffer bufs
[PIPE_BUFFERS
];
26 struct page
*tmp_page
;
30 unsigned int waiting_writers
;
31 unsigned int r_counter
;
32 unsigned int w_counter
;
33 struct fasync_struct
*fasync_readers
;
34 struct fasync_struct
*fasync_writers
;
37 /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
38 memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
39 #define PIPE_SIZE PAGE_SIZE
41 #define PIPE_MUTEX(inode) (&(inode).i_mutex)
42 #define PIPE_WAIT(inode) (&(inode).i_pipe->wait)
43 #define PIPE_READERS(inode) ((inode).i_pipe->readers)
44 #define PIPE_WRITERS(inode) ((inode).i_pipe->writers)
45 #define PIPE_WAITING_WRITERS(inode) ((inode).i_pipe->waiting_writers)
46 #define PIPE_RCOUNTER(inode) ((inode).i_pipe->r_counter)
47 #define PIPE_WCOUNTER(inode) ((inode).i_pipe->w_counter)
48 #define PIPE_FASYNC_READERS(inode) (&((inode).i_pipe->fasync_readers))
49 #define PIPE_FASYNC_WRITERS(inode) (&((inode).i_pipe->fasync_writers))
51 /* Drop the inode semaphore and wait for a pipe event, atomically */
52 void pipe_wait(struct inode
* inode
);
54 struct inode
* pipe_new(struct inode
* inode
);
55 void free_pipe_info(struct inode
* inode
);
58 * splice is tied to pipes as a transport (at least for now), so we'll just
59 * add the splice flags here.
61 #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
62 #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
63 /* we may still block on the fd we splice */
64 /* from/to, of course */
65 #define SPLICE_F_MORE (0x04) /* expect more data */
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