1/* 2 * Wrapper functions for accessing the file_struct fd array. 3 */ 4 5#ifndef __LINUX_FILE_H 6#define __LINUX_FILE_H 7 8#include <linux/compiler.h> 9#include <linux/types.h> 10#include <linux/posix_types.h> 11 12struct file; 13 14extern void fput(struct file *); 15 16struct file_operations; 17struct vfsmount; 18struct dentry; 19struct path; 20extern struct file *alloc_file(struct path *, fmode_t mode, 21 const struct file_operations *fop); 22 23static inline void fput_light(struct file *file, int fput_needed) 24{ 25 if (fput_needed) 26 fput(file); 27} 28 29struct fd { 30 struct file *file; 31 unsigned int flags; 32}; 33#define FDPUT_FPUT 1 34#define FDPUT_POS_UNLOCK 2 35 36static inline void fdput(struct fd fd) 37{ 38 if (fd.flags & FDPUT_FPUT) 39 fput(fd.file); 40} 41 42extern struct file *fget(unsigned int fd); 43extern struct file *fget_raw(unsigned int fd); 44extern unsigned long __fdget(unsigned int fd); 45extern unsigned long __fdget_raw(unsigned int fd); 46extern unsigned long __fdget_pos(unsigned int fd); 47 48static inline struct fd __to_fd(unsigned long v) 49{ 50 return (struct fd){(struct file *)(v & ~3),v & 3}; 51} 52 53static inline struct fd fdget(unsigned int fd) 54{ 55 return __to_fd(__fdget(fd)); 56} 57 58static inline struct fd fdget_raw(unsigned int fd) 59{ 60 return __to_fd(__fdget_raw(fd)); 61} 62 63extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); 64extern int replace_fd(unsigned fd, struct file *file, unsigned flags); 65extern void set_close_on_exec(unsigned int fd, int flag); 66extern bool get_close_on_exec(unsigned int fd); 67extern void put_filp(struct file *); 68extern int get_unused_fd_flags(unsigned flags); 69extern void put_unused_fd(unsigned int fd); 70 71extern void fd_install(unsigned int fd, struct file *file); 72 73extern void flush_delayed_fput(void); 74extern void __fput_sync(struct file *); 75 76#endif /* __LINUX_FILE_H */ 77