Manual Reference Pages - FALLOCATE (1)
fallocate - preallocate space to a file.
fallocate is used to preallocate blocks to a file. For filesystems which support the
fallocate system call, this is done quickly by allocating blocks and marking
them as uninitialized, requiring no IO to the data blocks. This is much faster
than creating a file by filling it with zeros.
As of the Linux Kernel v2.6.31, the fallocate system call is supported by the
btrfs, ext4, ocfs2, and xfs filesystems.
The exit code returned by
fallocate is 0 on success and 1 on failure.
Print help and exit.
Do not modify the apparent length of the file. This may effectively allocate
blocks past EOF, which can be removed with a truncate.
Punch holes in the file, the range should not exceed the length of the file.
Specifies the beginning offset of the allocation, in bytes. Suffixes of k, m,
g, t, p, e may be specified to denote KiB, MiB, GiB, etc.
Specifies the length of the allocation, in bytes. Suffixes of k, m, g, t, p, e
may be specified to denote KiB, MiB, GiB, etc.
Eric Sandeen <firstname.lastname@example.org>
Karel Zak <email@example.com>
The fallocate command is part of the util-linux-ng package and is available from
|Version 1.0 ||FALLOCATE (1) ||Jul 2009 |
Visit the GSP FreeBSD Man Page Interface.
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