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 | #include <linux/errno.h> |
13 | |
14 | struct file; |
15 | |
16 | extern void fput(struct file *); |
17 | |
18 | struct file_operations; |
19 | struct task_struct; |
20 | struct vfsmount; |
21 | struct dentry; |
22 | struct inode; |
23 | struct path; |
24 | extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *, |
25 | const char *, int flags, const struct file_operations *); |
26 | extern struct file *alloc_file_clone(struct file *, int flags, |
27 | const struct file_operations *); |
28 | |
29 | static inline void fput_light(struct file *file, int fput_needed) |
30 | { |
31 | if (fput_needed) |
32 | fput(file); |
33 | } |
34 | |
35 | struct fd { |
36 | struct file *file; |
37 | unsigned int flags; |
38 | }; |
39 | #define FDPUT_FPUT 1 |
40 | #define FDPUT_POS_UNLOCK 2 |
41 | |
42 | static inline void fdput(struct fd fd) |
43 | { |
44 | if (fd.flags & FDPUT_FPUT) |
45 | fput(fd.file); |
46 | } |
47 | |
48 | extern struct file *fget(unsigned int fd); |
49 | extern struct file *fget_raw(unsigned int fd); |
50 | extern struct file *fget_task(struct task_struct *task, unsigned int fd); |
51 | extern unsigned long __fdget(unsigned int fd); |
52 | extern unsigned long __fdget_raw(unsigned int fd); |
53 | extern unsigned long __fdget_pos(unsigned int fd); |
54 | extern void __f_unlock_pos(struct file *); |
55 | |
56 | static inline struct fd __to_fd(unsigned long v) |
57 | { |
58 | return (struct fd){(struct file *)(v & ~3),v & 3}; |
59 | } |
60 | |
61 | static inline struct fd fdget(unsigned int fd) |
62 | { |
63 | return __to_fd(__fdget(fd)); |
64 | } |
65 | |
66 | static inline struct fd fdget_raw(unsigned int fd) |
67 | { |
68 | return __to_fd(__fdget_raw(fd)); |
69 | } |
70 | |
71 | static inline struct fd fdget_pos(int fd) |
72 | { |
73 | return __to_fd(__fdget_pos(fd)); |
74 | } |
75 | |
76 | static inline void fdput_pos(struct fd f) |
77 | { |
78 | if (f.flags & FDPUT_POS_UNLOCK) |
79 | __f_unlock_pos(f.file); |
80 | fdput(f); |
81 | } |
82 | |
83 | extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); |
84 | extern int replace_fd(unsigned fd, struct file *file, unsigned flags); |
85 | extern void set_close_on_exec(unsigned int fd, int flag); |
86 | extern bool get_close_on_exec(unsigned int fd); |
87 | extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile); |
88 | extern int get_unused_fd_flags(unsigned flags); |
89 | extern void put_unused_fd(unsigned int fd); |
90 | |
91 | extern void fd_install(unsigned int fd, struct file *file); |
92 | |
93 | extern int __receive_fd(struct file *file, int __user *ufd, |
94 | unsigned int o_flags); |
95 | |
96 | extern int receive_fd(struct file *file, unsigned int o_flags); |
97 | |
98 | static inline int receive_fd_user(struct file *file, int __user *ufd, |
99 | unsigned int o_flags) |
100 | { |
101 | if (ufd == NULL) |
102 | return -EFAULT; |
103 | return __receive_fd(file, ufd, o_flags); |
104 | } |
105 | int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags); |
106 | |
107 | extern void flush_delayed_fput(void); |
108 | extern void __fput_sync(struct file *); |
109 | |
110 | extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; |
111 | |
112 | #endif /* __LINUX_FILE_H */ |
113 | |