1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* Wrapper functions for accessing the file_struct fd array.
*/
#ifndef __LINUX_FILE_H
#define __LINUX_FILE_H
extern void __fput(struct file *);
/*
* Check whether the specified task has the fd open. Since the task
* may not have a files_struct, we must test for p->files != NULL.
*/
extern inline struct file * fcheck_task(struct task_struct *p, unsigned int fd)
{
struct file * file = NULL;
if (p->files && fd < p->files->max_fds)
file = p->files->fd[fd];
return file;
}
/*
* Check whether the specified fd has an open file.
*/
extern inline struct file * fcheck(unsigned int fd)
{
struct file * file = NULL;
if (fd < current->files->max_fds)
file = current->files->fd[fd];
return file;
}
extern inline struct file * fget(unsigned int fd)
{
struct file * file = fcheck(fd);
if (file)
file->f_count++;
return file;
}
extern int get_unused_fd(void); /* in fs/open.c */
static inline void put_unused_fd(unsigned int fd)
{
FD_CLR(fd, current->files->open_fds);
if (fd < current->files->next_fd)
current->files->next_fd = fd;
}
/*
* Install a file pointer in the fd array.
*/
extern inline void fd_install(unsigned int fd, struct file *file)
{
current->files->fd[fd] = file;
}
/*
* 23/12/1998 Marcin Dalecki <dalecki@cs.net.pl>:
*
* Since those functions where calling other functions, it was compleatly
* bogous to make them all "extern inline".
*
* The removal of this pseudo optimization saved me scandaleous:
*
* 3756 (i386 arch)
*
* precious bytes from my kernel, even without counting all the code compiled
* as module!
*
* I suspect there are many other similar "optimizations" across the
* kernel...
*/
extern void fput(struct file *file);
extern void put_filp(struct file *file);
#endif
|
