Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 *);
16extern void fput_many(struct file *, unsigned int);
17
18struct file_operations;
19struct task_struct;
20struct vfsmount;
21struct dentry;
22struct inode;
23struct path;
24extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,
25 const char *, int flags, const struct file_operations *);
26extern struct file *alloc_file_clone(struct file *, int flags,
27 const struct file_operations *);
28
29static inline void fput_light(struct file *file, int fput_needed)
30{
31 if (fput_needed)
32 fput(file);
33}
34
35struct fd {
36 struct file *file;
37 unsigned int flags;
38};
39#define FDPUT_FPUT 1
40#define FDPUT_POS_UNLOCK 2
41
42static inline void fdput(struct fd fd)
43{
44 if (fd.flags & FDPUT_FPUT)
45 fput(fd.file);
46}
47
48extern struct file *fget(unsigned int fd);
49extern struct file *fget_many(unsigned int fd, unsigned int refs);
50extern struct file *fget_raw(unsigned int fd);
51extern struct file *fget_task(struct task_struct *task, unsigned int fd);
52extern unsigned long __fdget(unsigned int fd);
53extern unsigned long __fdget_raw(unsigned int fd);
54extern unsigned long __fdget_pos(unsigned int fd);
55extern void __f_unlock_pos(struct file *);
56
57static inline struct fd __to_fd(unsigned long v)
58{
59 return (struct fd){(struct file *)(v & ~3),v & 3};
60}
61
62static inline struct fd fdget(unsigned int fd)
63{
64 return __to_fd(__fdget(fd));
65}
66
67static inline struct fd fdget_raw(unsigned int fd)
68{
69 return __to_fd(__fdget_raw(fd));
70}
71
72static inline struct fd fdget_pos(int fd)
73{
74 return __to_fd(__fdget_pos(fd));
75}
76
77static inline void fdput_pos(struct fd f)
78{
79 if (f.flags & FDPUT_POS_UNLOCK)
80 __f_unlock_pos(f.file);
81 fdput(f);
82}
83
84extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
85extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
86extern void set_close_on_exec(unsigned int fd, int flag);
87extern bool get_close_on_exec(unsigned int fd);
88extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile);
89extern int get_unused_fd_flags(unsigned flags);
90extern void put_unused_fd(unsigned int fd);
91
92extern void fd_install(unsigned int fd, struct file *file);
93
94extern void flush_delayed_fput(void);
95extern void __fput_sync(struct file *);
96
97extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
98
99#endif /* __LINUX_FILE_H */