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