1/****************************************************************************
2 ****************************************************************************
3 ***
4 ***   This header was automatically generated from a Linux kernel header
5 ***   of the same name, to make information necessary for userspace to
6 ***   call into the kernel available to libc.  It contains only constants,
7 ***   structures, and macros generated from the original header, and thus,
8 ***   contains no copyrightable information.
9 ***
10 ****************************************************************************
11 ****************************************************************************/
12#ifndef _LINUX_RELAY_H
13#define _LINUX_RELAY_H
14
15#include <linux/types.h>
16#include <linux/sched.h>
17#include <linux/wait.h>
18#include <linux/list.h>
19#include <linux/fs.h>
20#include <linux/poll.h>
21#include <linux/kref.h>
22
23#define FIX_SIZE(x) ((((x) - 1) & PAGE_MASK) + PAGE_SIZE)
24
25#define RELAYFS_CHANNEL_VERSION 6
26
27struct rchan_buf
28{
29 void *start;
30 void *data;
31 size_t offset;
32 size_t subbufs_produced;
33 size_t subbufs_consumed;
34 struct rchan *chan;
35 wait_queue_head_t read_wait;
36 struct work_struct wake_readers;
37 struct dentry *dentry;
38 struct kref kref;
39 struct page **page_array;
40 unsigned int page_count;
41 unsigned int finalized;
42 size_t *padding;
43 size_t prev_padding;
44 size_t bytes_consumed;
45 unsigned int cpu;
46} ____cacheline_aligned;
47
48struct rchan
49{
50 u32 version;
51 size_t subbuf_size;
52 size_t n_subbufs;
53 size_t alloc_size;
54 struct rchan_callbacks *cb;
55 struct kref kref;
56 void *private_data;
57 size_t last_toobig;
58 struct rchan_buf *buf[NR_CPUS];
59};
60
61struct rchan_callbacks
62{
63
64 int (*subbuf_start) (struct rchan_buf *buf,
65 void *subbuf,
66 void *prev_subbuf,
67 size_t prev_padding);
68
69 void (*buf_mapped)(struct rchan_buf *buf,
70 struct file *filp);
71
72 void (*buf_unmapped)(struct rchan_buf *buf,
73 struct file *filp);
74
75 struct dentry *(*create_buf_file)(const char *filename,
76 struct dentry *parent,
77 int mode,
78 struct rchan_buf *buf,
79 int *is_global);
80
81 int (*remove_buf_file)(struct dentry *dentry);
82};
83
84struct rchan *relay_open(const char *base_filename,
85 struct dentry *parent,
86 size_t subbuf_size,
87 size_t n_subbufs,
88 struct rchan_callbacks *cb);
89
90#endif
91
92