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8#ifndef SPLICE_H
9#define SPLICE_H
10
11#include <linux/pipe_fs_i.h>
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14
15
16#define SPLICE_F_MOVE (0x01)
17#define SPLICE_F_NONBLOCK (0x02)
18
19
20#define SPLICE_F_MORE (0x04)
21#define SPLICE_F_GIFT (0x08)
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24
25
26struct splice_desc {
27 size_t total_len;
28 unsigned int len;
29 unsigned int flags;
30
31
32
33 union {
34 void __user *userptr;
35 struct file *file;
36 void *data;
37 } u;
38 loff_t pos;
39 loff_t *opos;
40 size_t num_spliced;
41 bool need_wakeup;
42};
43
44struct partial_page {
45 unsigned int offset;
46 unsigned int len;
47 unsigned long private;
48};
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52
53struct splice_pipe_desc {
54 struct page **pages;
55 struct partial_page *partial;
56 int nr_pages;
57 unsigned int nr_pages_max;
58 unsigned int flags;
59 const struct pipe_buf_operations *ops;
60 void (*spd_release)(struct splice_pipe_desc *, unsigned int);
61};
62
63typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
64 struct splice_desc *);
65typedef int (splice_direct_actor)(struct pipe_inode_info *,
66 struct splice_desc *);
67
68extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
69 loff_t *, size_t, unsigned int,
70 splice_actor *);
71extern ssize_t __splice_from_pipe(struct pipe_inode_info *,
72 struct splice_desc *, splice_actor *);
73extern ssize_t splice_to_pipe(struct pipe_inode_info *,
74 struct splice_pipe_desc *);
75extern ssize_t add_to_pipe(struct pipe_inode_info *,
76 struct pipe_buffer *);
77extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
78 splice_direct_actor *);
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83extern int splice_grow_spd(const struct pipe_inode_info *, struct splice_pipe_desc *);
84extern void splice_shrink_spd(struct splice_pipe_desc *);
85extern void spd_release_page(struct splice_pipe_desc *, unsigned int);
86
87extern const struct pipe_buf_operations page_cache_pipe_buf_ops;
88extern const struct pipe_buf_operations default_pipe_buf_ops;
89#endif
90