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
13 struct file;
14
15 extern void fput(struct file *);
16
17 struct file_operations;
18 struct vfsmount;
19 struct dentry;
20 struct inode;
21 struct path;
22 extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,
23 const char *, int flags, const struct file_operations *);
24 extern struct file *alloc_file_clone(struct file *, int flags,
25 const struct file_operations *);
26
fput_light(struct file * file,int fput_needed)27 static inline void fput_light(struct file *file, int fput_needed)
28 {
29 if (fput_needed)
30 fput(file);
31 }
32
33 struct fd {
34 struct file *file;
35 unsigned int flags;
36 };
37 #define FDPUT_FPUT 1
38 #define FDPUT_POS_UNLOCK 2
39
fdput(struct fd fd)40 static inline void fdput(struct fd fd)
41 {
42 if (fd.flags & FDPUT_FPUT)
43 fput(fd.file);
44 }
45
46 extern struct file *fget(unsigned int fd);
47 extern struct file *fget_raw(unsigned int fd);
48 extern unsigned long __fdget(unsigned int fd);
49 extern unsigned long __fdget_raw(unsigned int fd);
50 extern unsigned long __fdget_pos(unsigned int fd);
51 extern void __f_unlock_pos(struct file *);
52
__to_fd(unsigned long v)53 static inline struct fd __to_fd(unsigned long v)
54 {
55 return (struct fd){(struct file *)(v & ~3),v & 3};
56 }
57
fdget(unsigned int fd)58 static inline struct fd fdget(unsigned int fd)
59 {
60 return __to_fd(__fdget(fd));
61 }
62
fdget_raw(unsigned int fd)63 static inline struct fd fdget_raw(unsigned int fd)
64 {
65 return __to_fd(__fdget_raw(fd));
66 }
67
fdget_pos(int fd)68 static inline struct fd fdget_pos(int fd)
69 {
70 return __to_fd(__fdget_pos(fd));
71 }
72
fdput_pos(struct fd f)73 static inline void fdput_pos(struct fd f)
74 {
75 if (f.flags & FDPUT_POS_UNLOCK)
76 __f_unlock_pos(f.file);
77 fdput(f);
78 }
79
80 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
81 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
82 extern void set_close_on_exec(unsigned int fd, int flag);
83 extern bool get_close_on_exec(unsigned int fd);
84 extern int get_unused_fd_flags(unsigned flags);
85 extern void put_unused_fd(unsigned int fd);
86
87 extern void fd_install(unsigned int fd, struct file *file);
88
89 extern void flush_delayed_fput(void);
90 extern void __fput_sync(struct file *);
91
92 #endif /* __LINUX_FILE_H */
93
