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 | #include <linux/cleanup.h> |
14 | |
15 | struct file; |
16 | |
17 | extern void fput(struct file *); |
18 | |
19 | struct file_operations; |
20 | struct task_struct; |
21 | struct vfsmount; |
22 | struct dentry; |
23 | struct inode; |
24 | struct path; |
25 | extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *, |
26 | const char *, int flags, const struct file_operations *); |
27 | extern struct file *alloc_file_clone(struct file *, int flags, |
28 | const struct file_operations *); |
29 | |
30 | static inline void fput_light(struct file *file, int fput_needed) |
31 | { |
32 | if (fput_needed) |
33 | fput(file); |
34 | } |
35 | |
36 | struct fd { |
37 | struct file *file; |
38 | unsigned int flags; |
39 | }; |
40 | #define FDPUT_FPUT 1 |
41 | #define FDPUT_POS_UNLOCK 2 |
42 | |
43 | static inline void fdput(struct fd fd) |
44 | { |
45 | if (fd.flags & FDPUT_FPUT) |
46 | fput(fd.file); |
47 | } |
48 | |
49 | extern struct file *fget(unsigned int fd); |
50 | extern struct file *fget_raw(unsigned int fd); |
51 | extern struct file *fget_task(struct task_struct *task, unsigned int fd); |
52 | extern unsigned long __fdget(unsigned int fd); |
53 | extern unsigned long __fdget_raw(unsigned int fd); |
54 | extern unsigned long __fdget_pos(unsigned int fd); |
55 | extern void __f_unlock_pos(struct file *); |
56 | |
57 | static inline struct fd __to_fd(unsigned long v) |
58 | { |
59 | return (struct fd){(struct file *)(v & ~3),v & 3}; |
60 | } |
61 | |
62 | static inline struct fd fdget(unsigned int fd) |
63 | { |
64 | return __to_fd(v: __fdget(fd)); |
65 | } |
66 | |
67 | static inline struct fd fdget_raw(unsigned int fd) |
68 | { |
69 | return __to_fd(v: __fdget_raw(fd)); |
70 | } |
71 | |
72 | static inline struct fd fdget_pos(int fd) |
73 | { |
74 | return __to_fd(v: __fdget_pos(fd)); |
75 | } |
76 | |
77 | static inline void fdput_pos(struct fd f) |
78 | { |
79 | if (f.flags & FDPUT_POS_UNLOCK) |
80 | __f_unlock_pos(f.file); |
81 | fdput(fd: f); |
82 | } |
83 | |
84 | DEFINE_CLASS(fd, struct fd, fdput(_T), fdget(fd), int fd) |
85 | |
86 | extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); |
87 | extern int replace_fd(unsigned fd, struct file *file, unsigned flags); |
88 | extern void set_close_on_exec(unsigned int fd, int flag); |
89 | extern bool get_close_on_exec(unsigned int fd); |
90 | extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile); |
91 | extern int get_unused_fd_flags(unsigned flags); |
92 | extern void put_unused_fd(unsigned int fd); |
93 | |
94 | DEFINE_CLASS(get_unused_fd, int, if (_T >= 0) put_unused_fd(_T), |
95 | get_unused_fd_flags(flags), unsigned flags) |
96 | |
97 | extern void fd_install(unsigned int fd, struct file *file); |
98 | |
99 | extern int __receive_fd(struct file *file, int __user *ufd, |
100 | unsigned int o_flags); |
101 | |
102 | extern int receive_fd(struct file *file, unsigned int o_flags); |
103 | |
104 | static inline int receive_fd_user(struct file *file, int __user *ufd, |
105 | unsigned int o_flags) |
106 | { |
107 | if (ufd == NULL) |
108 | return -EFAULT; |
109 | return __receive_fd(file, ufd, o_flags); |
110 | } |
111 | int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags); |
112 | |
113 | extern void flush_delayed_fput(void); |
114 | extern void __fput_sync(struct file *); |
115 | |
116 | extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; |
117 | |
118 | #endif /* __LINUX_FILE_H */ |
119 | |