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