LXR linux/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
  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