#ifndef _BACKING_H_31089a28_
#define _BACKING_H_31089a28_

#include <sys/stat.h>

typedef struct backing BACKING;

struct backing {
  int (*write)(void *, unsigned int, const void *);
  int (*read)(void *, unsigned int, unsigned int, void *);
  void (*set_size)(void *, unsigned int);
  void (*done)(void *);
  const char *(*detail)(void *);
  void *(*open)(const char *, void (*)(const char *, ...));
  int (*fstat)(void *, struct stat *);
  void (*move)(void **, void **);
  int (*flock)(void *, int);
  } ;
#define BACKING_INIT(name) {\
	&name##_write, &name##_read, &name##_set_size,		\
	&name##_done, &name##_detail, &name##_open,		\
	&name##_fstat, &name##_move, &name##_flock	}

extern const BACKING backing_simple;
extern const BACKING backing_snapshot;

/* Exported by lbd.c, used by backing.h */

extern int cwd_fd;

#endif