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
81
82
83
|
/*
* Wrapper functions for accessing the file_struct fd array.
*/
#ifndef __LINUX_FILE_H
#define __LINUX_FILE_H
extern void __fput(struct file *);
extern void insert_file_free(struct file *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;
}
/*
* Install a file pointer in the fd array.
*/
extern inline void fd_install(unsigned int fd, struct file *file)
{
current->files->fd[fd] = file;
}
/* It does not matter which list it is on. */
extern inline void remove_filp(struct file *file)
{
if(file->f_next)
file->f_next->f_pprev = file->f_pprev;
*file->f_pprev = file->f_next;
}
extern inline void fput(struct file *file)
{
int count = file->f_count-1;
if (!count) {
locks_remove_flock(file);
__fput(file);
file->f_count = 0;
remove_filp(file);
insert_file_free(file);
} else
file->f_count = count;
}
extern inline void put_filp(struct file *file)
{
if(--file->f_count == 0) {
remove_filp(file);
insert_file_free(file);
}
}
#endif
|
