linux/include/linux/file.h
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   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        int need_put;
  32};
  33
  34static inline void fdput(struct fd fd)
  35{
  36        if (fd.need_put)
  37                fput(fd.file);
  38}
  39
  40extern struct file *fget(unsigned int fd);
  41extern struct file *fget_light(unsigned int fd, int *fput_needed);
  42
  43static inline struct fd fdget(unsigned int fd)
  44{
  45        int b;
  46        struct file *f = fget_light(fd, &b);
  47        return (struct fd){f,b};
  48}
  49
  50extern struct file *fget_raw(unsigned int fd);
  51extern struct file *fget_raw_light(unsigned int fd, int *fput_needed);
  52
  53static inline struct fd fdget_raw(unsigned int fd)
  54{
  55        int b;
  56        struct file *f = fget_raw_light(fd, &b);
  57        return (struct fd){f,b};
  58}
  59
  60extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
  61extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
  62extern void set_close_on_exec(unsigned int fd, int flag);
  63extern bool get_close_on_exec(unsigned int fd);
  64extern void put_filp(struct file *);
  65extern int get_unused_fd_flags(unsigned flags);
  66#define get_unused_fd() get_unused_fd_flags(0)
  67extern void put_unused_fd(unsigned int fd);
  68
  69extern void fd_install(unsigned int fd, struct file *file);
  70
  71extern void flush_delayed_fput(void);
  72extern void __fput_sync(struct file *);
  73
  74#endif /* __LINUX_FILE_H */
  75
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