1/*
2 * Wrapper functions for accessing the file_struct fd array.
3 */
4
5#ifndef __LINUX_FILE_H
6#define __LINUX_FILE_H
7
8#include <linux/compiler.h>
9#include <linux/types.h>
10#include <linux/posix_types.h>
11
12struct file;
13
14extern void fput(struct file *);
15
16struct file_operations;
17struct vfsmount;
18struct dentry;
19struct path;
20extern struct file *alloc_file(struct path *, fmode_t mode,
21	const struct file_operations *fop);
22
23static inline void fput_light(struct file *file, int fput_needed)
24{
25	if (fput_needed)
26		fput(file);
27}
28
29struct fd {
30	struct file *file;
31	unsigned int flags;
32};
33#define FDPUT_FPUT       1
34#define FDPUT_POS_UNLOCK 2
35
36static inline void fdput(struct fd fd)
37{
38	if (fd.flags & FDPUT_FPUT)
39		fput(fd.file);
40}
41
42extern struct file *fget(unsigned int fd);
43extern struct file *fget_raw(unsigned int fd);
44extern unsigned long __fdget(unsigned int fd);
45extern unsigned long __fdget_raw(unsigned int fd);
46extern unsigned long __fdget_pos(unsigned int fd);
47
48static inline struct fd __to_fd(unsigned long v)
49{
50	return (struct fd){(struct file *)(v & ~3),v & 3};
51}
52
53static inline struct fd fdget(unsigned int fd)
54{
55	return __to_fd(__fdget(fd));
56}
57
58static inline struct fd fdget_raw(unsigned int fd)
59{
60	return __to_fd(__fdget_raw(fd));
61}
62
63extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
64extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
65extern void set_close_on_exec(unsigned int fd, int flag);
66extern bool get_close_on_exec(unsigned int fd);
67extern void put_filp(struct file *);
68extern int get_unused_fd_flags(unsigned flags);
69extern void put_unused_fd(unsigned int fd);
70
71extern void fd_install(unsigned int fd, struct file *file);
72
73extern void flush_delayed_fput(void);
74extern void __fput_sync(struct file *);
75
76#endif /* __LINUX_FILE_H */
77