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1 | /* |
2 | * Function declerations and data structures related to the splice |
3 | * implementation. |
4 | * |
5 | * Copyright (C) 2007 Jens Axboe <jens.axboe@oracle.com> |
6 | * |
7 | */ |
8 | #ifndef SPLICE_H |
9 | #define SPLICE_H |
10 | |
11 | #include <linux/pipe_fs_i.h> |
12 | |
13 | /* |
14 | * Flags passed in from splice/tee/vmsplice |
15 | */ |
16 | #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */ |
17 | #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */ |
18 | /* we may still block on the fd we splice */ |
19 | /* from/to, of course */ |
20 | #define SPLICE_F_MORE (0x04) /* expect more data */ |
21 | #define SPLICE_F_GIFT (0x08) /* pages passed in are a gift */ |
22 | |
23 | /* |
24 | * Passed to the actors |
25 | */ |
26 | struct splice_desc { |
27 | unsigned int len, total_len; /* current and remaining length */ |
28 | unsigned int flags; /* splice flags */ |
29 | /* |
30 | * actor() private data |
31 | */ |
32 | union { |
33 | void __user *userptr; /* memory to write to */ |
34 | struct file *file; /* file to read/write */ |
35 | void *data; /* cookie */ |
36 | } u; |
37 | loff_t pos; /* file position */ |
38 | size_t num_spliced; /* number of bytes already spliced */ |
39 | bool need_wakeup; /* need to wake up writer */ |
40 | }; |
41 | |
42 | struct partial_page { |
43 | unsigned int offset; |
44 | unsigned int len; |
45 | unsigned long private; |
46 | }; |
47 | |
48 | /* |
49 | * Passed to splice_to_pipe |
50 | */ |
51 | struct splice_pipe_desc { |
52 | struct page **pages; /* page map */ |
53 | struct partial_page *partial; /* pages[] may not be contig */ |
54 | int nr_pages; /* number of pages in map */ |
55 | unsigned int flags; /* splice flags */ |
56 | const struct pipe_buf_operations *ops;/* ops associated with output pipe */ |
57 | void (*spd_release)(struct splice_pipe_desc *, unsigned int); |
58 | }; |
59 | |
60 | typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *, |
61 | struct splice_desc *); |
62 | typedef int (splice_direct_actor)(struct pipe_inode_info *, |
63 | struct splice_desc *); |
64 | |
65 | extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *, |
66 | loff_t *, size_t, unsigned int, |
67 | splice_actor *); |
68 | extern ssize_t __splice_from_pipe(struct pipe_inode_info *, |
69 | struct splice_desc *, splice_actor *); |
70 | extern int splice_from_pipe_feed(struct pipe_inode_info *, struct splice_desc *, |
71 | splice_actor *); |
72 | extern int splice_from_pipe_next(struct pipe_inode_info *, |
73 | struct splice_desc *); |
74 | extern void splice_from_pipe_begin(struct splice_desc *); |
75 | extern void splice_from_pipe_end(struct pipe_inode_info *, |
76 | struct splice_desc *); |
77 | extern int pipe_to_file(struct pipe_inode_info *, struct pipe_buffer *, |
78 | struct splice_desc *); |
79 | |
80 | extern ssize_t splice_to_pipe(struct pipe_inode_info *, |
81 | struct splice_pipe_desc *); |
82 | extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *, |
83 | splice_direct_actor *); |
84 | |
85 | #endif |
86 |
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