include/linux/file.h

   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
  12 struct file;
  13
  14 extern void fput(struct file *);
  15
  16 struct file_operations;
  17 struct vfsmount;
  18 struct dentry;
  19 struct path;
  20 extern struct file *alloc_file(struct path *, fmode_t mode,
  21         const struct file_operations *fop);
  22
  23 static inline void fput_light(struct file *file, int fput_needed)
  24 {
  25         if (fput_needed)
  26                 fput(file);
  27 }
  28
  29 struct fd {
  30         struct file *file;
  31         int need_put;
  32 };
  33
  34 static inline void fdput(struct fd fd)
  35 {
  36         if (fd.need_put)
  37                 fput(fd.file);
  38 }
  39
  40 extern struct file *fget(unsigned int fd);
  41 extern struct file *fget_light(unsigned int fd, int *fput_needed);
  42
  43 static 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
  50 extern struct file *fget_raw(unsigned int fd);
  51 extern struct file *fget_raw_light(unsigned int fd, int *fput_needed);
  52
  53 static 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
  60 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
  61 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
  62 extern void set_close_on_exec(unsigned int fd, int flag);
  63 extern bool get_close_on_exec(unsigned int fd);
  64 extern void put_filp(struct file *);
  65 extern int get_unused_fd_flags(unsigned flags);
  66 #define get_unused_fd() get_unused_fd_flags(0)
  67 extern void put_unused_fd(unsigned int fd);
  68
  69 extern void fd_install(unsigned int fd, struct file *file);
  70
  71 extern void flush_delayed_fput(void);
  72 extern void __fput_sync(struct file *);
  73
  74 #endif /* __LINUX_FILE_H */