2 * Function declerations and data structures related to the splice
5 * Copyright (C) 2007 Jens Axboe <jens.axboe@oracle.com>
11 #include <linux/pipe_fs_i.h>
14 * splice is tied to pipes as a transport (at least for now), so we'll just
15 * add the splice flags here.
17 #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
18 #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
19 /* we may still block on the fd we splice */
20 /* from/to, of course */
21 #define SPLICE_F_MORE (0x04) /* expect more data */
22 #define SPLICE_F_GIFT (0x08) /* pages passed in are a gift */
25 * Passed to the actors
28 unsigned int len
, total_len
; /* current and remaining length */
29 unsigned int flags
; /* splice flags */
31 * actor() private data
34 void __user
*userptr
; /* memory to write to */
35 struct file
*file
; /* file to read/write */
36 void *data
; /* cookie */
38 loff_t pos
; /* file position */
39 size_t num_spliced
; /* number of bytes already spliced */
40 bool need_wakeup
; /* need to wake up writer */
46 unsigned long private;
50 * Passed to splice_to_pipe
52 struct splice_pipe_desc
{
53 struct page
**pages
; /* page map */
54 struct partial_page
*partial
; /* pages[] may not be contig */
55 int nr_pages
; /* number of pages in map */
56 unsigned int flags
; /* splice flags */
57 const struct pipe_buf_operations
*ops
;/* ops associated with output pipe */
58 void (*spd_release
)(struct splice_pipe_desc
*, unsigned int);
61 typedef int (splice_actor
)(struct pipe_inode_info
*, struct pipe_buffer
*,
62 struct splice_desc
*);
63 typedef int (splice_direct_actor
)(struct pipe_inode_info
*,
64 struct splice_desc
*);
66 extern ssize_t
splice_from_pipe(struct pipe_inode_info
*, struct file
*,
67 loff_t
*, size_t, unsigned int,
69 extern ssize_t
__splice_from_pipe(struct pipe_inode_info
*,
70 struct splice_desc
*, splice_actor
*);
71 extern int splice_from_pipe_feed(struct pipe_inode_info
*, struct splice_desc
*,
73 extern int splice_from_pipe_next(struct pipe_inode_info
*,
74 struct splice_desc
*);
75 extern void splice_from_pipe_begin(struct splice_desc
*);
76 extern void splice_from_pipe_end(struct pipe_inode_info
*,
77 struct splice_desc
*);
78 extern int pipe_to_file(struct pipe_inode_info
*, struct pipe_buffer
*,
79 struct splice_desc
*);
81 extern ssize_t
splice_to_pipe(struct pipe_inode_info
*,
82 struct splice_pipe_desc
*);
83 extern ssize_t
splice_direct_to_actor(struct file
*, struct splice_desc
*,
84 splice_direct_actor
*);
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