1 #ifndef _UAPI_FALLOC_H_
2 #define _UAPI_FALLOC_H_
4 #define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */
5 #define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */
6 #define FALLOC_FL_NO_HIDE_STALE 0x04 /* reserved codepoint */
9 * FALLOC_FL_COLLAPSE_RANGE is used to remove a range of a file
10 * without leaving a hole in the file. The contents of the file beyond
11 * the range being removed is appended to the start offset of the range
12 * being removed (i.e. the hole that was punched is "collapsed"),
13 * resulting in a file layout that looks like the range that was
14 * removed never existed. As such collapsing a range of a file changes
15 * the size of the file, reducing it by the same length of the range
16 * that has been removed by the operation.
18 * Different filesystems may implement different limitations on the
19 * granularity of the operation. Most will limit operations to
20 * filesystem block size boundaries, but this boundary may be larger or
21 * smaller depending on the filesystem and/or the configuration of the
24 * Attempting to collapse a range that crosses the end of the file is
25 * considered an illegal operation - just use ftruncate(2) if you need
26 * to collapse a range that crosses EOF.
28 #define FALLOC_FL_COLLAPSE_RANGE 0x08
30 #endif /* _UAPI_FALLOC_H_ */