uapi/linux/falloc.h

1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
6 #define FALLOC_FL_PUNCH_HOLE	0x02 /* de-allocates range */
20  * granularity of the operation. Most will limit operations to
21  * filesystem block size boundaries, but this boundary may be larger or
22  * smaller depending on the filesystem and/or the configuration of the
23  * filesystem or file.
26  * considered an illegal operation - just use ftruncate(2) if you need
35  * unwritten extents - even though file system may choose to zero out the
36  * extent or do whatever which will result in reading zeros from the range
48  * shifted towards right by len bytes to create a hole.  As such, this
49  * operation will increase the size of the file by len bytes.
52  * of the operation. Most will limit operations to filesystem block size
53  * boundaries, but this boundary may be larger or smaller depending on
54  * the filesystem and/or the configuration of the filesystem or file.
56  * Attempting to insert space using this flag at OR beyond the end of
57  * the file is considered an illegal operation - just use ftruncate(2) or
66  * copy-on-write.
69  * granularity of the operation. Most will limit operations to filesystem
70  * block size boundaries, but this boundary may be larger or smaller
71  * depending on the filesystem and/or the configuration of the filesystem
72  * or file.
74  * This flag can only be used with allocate-mode fallocate, which is
75  * to say that it cannot be used with the punch, zero, collapse, or