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