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