1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Wrapper functions for accessing the file_struct fd array.
9 #include <linux/compiler.h>
10 #include <linux/types.h>
11 #include <linux/posix_types.h>
12 #include <linux/errno.h>
16 extern void fput(struct file *);
18 struct file_operations;
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 *);
29 static inline void fput_light(struct file *file, int fput_needed)
40 #define FDPUT_POS_UNLOCK 2
42 static inline void fdput(struct fd fd)
44 if (fd.flags & FDPUT_FPUT)
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 *);
56 static inline struct fd __to_fd(unsigned long v)
58 return (struct fd){(struct file *)(v & ~3),v & 3};
61 static inline struct fd fdget(unsigned int fd)
63 return __to_fd(__fdget(fd));
66 static inline struct fd fdget_raw(unsigned int fd)
68 return __to_fd(__fdget_raw(fd));
71 static inline struct fd fdget_pos(int fd)
73 return __to_fd(__fdget_pos(fd));
76 static inline void fdput_pos(struct fd f)
78 if (f.flags & FDPUT_POS_UNLOCK)
79 __f_unlock_pos(f.file);
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);
91 extern void fd_install(unsigned int fd, struct file *file);
93 extern int __receive_fd(struct file *file, int __user *ufd,
94 unsigned int o_flags);
96 extern int receive_fd(struct file *file, unsigned int o_flags);
98 static inline int receive_fd_user(struct file *file, int __user *ufd,
103 return __receive_fd(file, ufd, o_flags);
105 int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags);
107 extern void flush_delayed_fput(void);
108 extern void __fput_sync(struct file *);
110 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
112 #endif /* __LINUX_FILE_H */