#ifndef _UAPI_FALLOC_H_
#define _UAPI_FALLOC_H_

#define FALLOC_FL_KEEP_SIZE	0x01 /* default is extend size */
#define FALLOC_FL_PUNCH_HOLE	0x02 /* de-allocates range */
#define FALLOC_FL_NO_HIDE_STALE	0x04 /* reserved codepoint */

/*
 * FALLOC_FL_COLLAPSE_RANGE is used to remove a range of a file
 * without leaving a hole in the file. The contents of the file beyond
 * the range being removed is appended to the start offset of the range
 * being removed (i.e. the hole that was punched is "collapsed"),
 * resulting in a file layout that looks like the range that was
 * removed never existed. As such collapsing a range of a file changes
 * the size of the file, reducing it by the same length of the range
 * that has been removed by the operation.
 *
 * Different filesystems may implement different limitations on the
 * granularity of the operation. Most will limit operations to
 * filesystem block size boundaries, but this boundary may be larger or
 * smaller depending on the filesystem and/or the configuration of the
 * filesystem or file.
 *
 * Attempting to collapse a range that crosses the end of the file is
 * considered an illegal operation - just use ftruncate(2) if you need
 * to collapse a range that crosses EOF.
 */
#define FALLOC_FL_COLLAPSE_RANGE	0x08

#endif /* _UAPI_FALLOC_H_ */