Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Wrapper functions for accessing the file_struct fd array.
4 */
5
6#ifndef __LINUX_FILE_H
7#define __LINUX_FILE_H
8
9#include <linux/compiler.h>
10#include <linux/types.h>
11#include <linux/posix_types.h>
12
13struct file;
14
15extern void fput(struct file *);
16
17struct file_operations;
18struct vfsmount;
19struct dentry;
20struct path;
21extern struct file *alloc_file(const struct path *, fmode_t mode,
22 const struct file_operations *fop);
23
24static inline void fput_light(struct file *file, int fput_needed)
25{
26 if (fput_needed)
27 fput(file);
28}
29
30struct fd {
31 struct file *file;
32 unsigned int flags;
33};
34#define FDPUT_FPUT 1
35#define FDPUT_POS_UNLOCK 2
36
37static inline void fdput(struct fd fd)
38{
39 if (fd.flags & FDPUT_FPUT)
40 fput(fd.file);
41}
42
43extern struct file *fget(unsigned int fd);
44extern struct file *fget_raw(unsigned int fd);
45extern unsigned long __fdget(unsigned int fd);
46extern unsigned long __fdget_raw(unsigned int fd);
47extern unsigned long __fdget_pos(unsigned int fd);
48extern void __f_unlock_pos(struct file *);
49
50static inline struct fd __to_fd(unsigned long v)
51{
52 return (struct fd){(struct file *)(v & ~3),v & 3};
53}
54
55static inline struct fd fdget(unsigned int fd)
56{
57 return __to_fd(__fdget(fd));
58}
59
60static inline struct fd fdget_raw(unsigned int fd)
61{
62 return __to_fd(__fdget_raw(fd));
63}
64
65static inline struct fd fdget_pos(int fd)
66{
67 return __to_fd(__fdget_pos(fd));
68}
69
70static inline void fdput_pos(struct fd f)
71{
72 if (f.flags & FDPUT_POS_UNLOCK)
73 __f_unlock_pos(f.file);
74 fdput(f);
75}
76
77extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
78extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
79extern void set_close_on_exec(unsigned int fd, int flag);
80extern bool get_close_on_exec(unsigned int fd);
81extern void put_filp(struct file *);
82extern int get_unused_fd_flags(unsigned flags);
83extern void put_unused_fd(unsigned int fd);
84
85extern void fd_install(unsigned int fd, struct file *file);
86
87extern void flush_delayed_fput(void);
88extern void __fput_sync(struct file *);
89
90#endif /* __LINUX_FILE_H */