1 #ifndef _LINUX_PIPE_FS_I_H
2 #define _LINUX_PIPE_FS_I_H
4 #define PIPEFS_MAGIC 0x50495045
6 #define PIPE_BUFFERS (16)
8 #define PIPE_BUF_FLAG_STOLEN 0x01
9 #define PIPE_BUF_FLAG_LRU 0x02
13 unsigned int offset
, len
;
14 struct pipe_buf_operations
*ops
;
18 struct pipe_buf_operations
{
20 void * (*map
)(struct file
*, struct pipe_inode_info
*, struct pipe_buffer
*);
21 void (*unmap
)(struct pipe_inode_info
*, struct pipe_buffer
*);
22 void (*release
)(struct pipe_inode_info
*, struct pipe_buffer
*);
23 int (*steal
)(struct pipe_inode_info
*, struct pipe_buffer
*);
26 struct pipe_inode_info
{
27 wait_queue_head_t wait
;
28 unsigned int nrbufs
, curbuf
;
29 struct pipe_buffer bufs
[PIPE_BUFFERS
];
30 struct page
*tmp_page
;
34 unsigned int waiting_writers
;
35 unsigned int r_counter
;
36 unsigned int w_counter
;
37 struct fasync_struct
*fasync_readers
;
38 struct fasync_struct
*fasync_writers
;
42 /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
43 memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
44 #define PIPE_SIZE PAGE_SIZE
46 #define PIPE_MUTEX(inode) (&(inode).i_mutex)
47 #define PIPE_WAIT(inode) (&(inode).i_pipe->wait)
48 #define PIPE_READERS(inode) ((inode).i_pipe->readers)
49 #define PIPE_WRITERS(inode) ((inode).i_pipe->writers)
50 #define PIPE_WAITING_WRITERS(inode) ((inode).i_pipe->waiting_writers)
51 #define PIPE_RCOUNTER(inode) ((inode).i_pipe->r_counter)
52 #define PIPE_WCOUNTER(inode) ((inode).i_pipe->w_counter)
53 #define PIPE_FASYNC_READERS(inode) (&((inode).i_pipe->fasync_readers))
54 #define PIPE_FASYNC_WRITERS(inode) (&((inode).i_pipe->fasync_writers))
56 /* Drop the inode semaphore and wait for a pipe event, atomically */
57 void pipe_wait(struct pipe_inode_info
*pipe
);
59 struct pipe_inode_info
* alloc_pipe_info(struct inode
* inode
);
60 void free_pipe_info(struct inode
* inode
);
63 * splice is tied to pipes as a transport (at least for now), so we'll just
64 * add the splice flags here.
66 #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
67 #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
68 /* we may still block on the fd we splice */
69 /* from/to, of course */
70 #define SPLICE_F_MORE (0x04) /* expect more data */
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