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
*);
24 void (*get
)(struct pipe_inode_info
*, struct pipe_buffer
*);
27 struct pipe_inode_info
{
28 wait_queue_head_t wait
;
29 unsigned int nrbufs
, curbuf
;
30 struct pipe_buffer bufs
[PIPE_BUFFERS
];
31 struct page
*tmp_page
;
35 unsigned int waiting_writers
;
36 unsigned int r_counter
;
37 unsigned int w_counter
;
38 struct fasync_struct
*fasync_readers
;
39 struct fasync_struct
*fasync_writers
;
43 /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
44 memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
45 #define PIPE_SIZE PAGE_SIZE
47 /* Drop the inode semaphore and wait for a pipe event, atomically */
48 void pipe_wait(struct pipe_inode_info
*pipe
);
50 struct pipe_inode_info
* alloc_pipe_info(struct inode
* inode
);
51 void free_pipe_info(struct inode
* inode
);
52 void __free_pipe_info(struct pipe_inode_info
*);
55 * splice is tied to pipes as a transport (at least for now), so we'll just
56 * add the splice flags here.
58 #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
59 #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
60 /* we may still block on the fd we splice */
61 /* from/to, of course */
62 #define SPLICE_F_MORE (0x04) /* expect more data */
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