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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/splice.h
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 */
44 unsigned long private;
48 * Passed to splice_to_pipe
50 struct splice_pipe_desc
{
51 struct page
**pages
; /* page map */
52 struct partial_page
*partial
; /* pages[] may not be contig */
53 int nr_pages
; /* number of pages in map */
54 unsigned int flags
; /* splice flags */
55 const struct pipe_buf_operations
*ops
;/* ops associated with output pipe */
56 void (*spd_release
)(struct splice_pipe_desc
*, unsigned int);
59 typedef int (splice_actor
)(struct pipe_inode_info
*, struct pipe_buffer
*,
60 struct splice_desc
*);
61 typedef int (splice_direct_actor
)(struct pipe_inode_info
*,
62 struct splice_desc
*);
64 extern ssize_t
splice_from_pipe(struct pipe_inode_info
*, struct file
*,
65 loff_t
*, size_t, unsigned int,
67 extern ssize_t
__splice_from_pipe(struct pipe_inode_info
*,
68 struct splice_desc
*, splice_actor
*);
69 extern ssize_t
splice_to_pipe(struct pipe_inode_info
*,
70 struct splice_pipe_desc
*);
71 extern ssize_t
splice_direct_to_actor(struct file
*, struct splice_desc
*,
72 splice_direct_actor
*);