uninitialized, requiring no IO to the data blocks.
This is much faster than creating a file by filling it with zeroes.
.PP
-.PP
-Note that a filesystem may place limitations on the granularity of some
-fallocate operations. Typically,
-.I offset
-and
-.I lenght
-must be a multiple of the
-filesystem logical block size, which varies according to the filesystem type
-and configuration. If a filesystem has such a requirement, the operation will
-fail with the error EINVAL (Invalid argument) if this requirement is violated.
-.PP
The exit status returned by
.B fallocate
is 0 on success and 1 on failure.