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FALLOCATE(1)									     FALLOCATE(1)

NAME
       fallocate - preallocate space to a file.

SYNOPSIS
       fallocate [-n] [-o offset] -l length filename

DESCRIPTION
       fallocate is used to preallocate blocks to a file.  For filesystems which support the fal-
       locate system call, this is done quickly by allocating blocks and marking them  as  unini-
       tialized, 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.

OPTIONS
       -h, --help
	      Print help and exit.

       -n, --keep-size
	      Do not modify the apparent length of the file. This may effectively allocate blocks
	      past EOF, which can be removed with a truncate.

       -o, --offset offset
	      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.

       -l, --length length
	      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.

AUTHORS
       Eric Sandeen <sandeen@redhat.com>
       Karel Zak <kzak@redhat.com>

SEE ALSO
       fallocate(2), posix_fallocate(3), truncate(1)

AVAILABILITY
       The fallocate command  is  part	of  the  util-linux-ng	package  and  is  available  from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

Version 1.0				     Jul 2009				     FALLOCATE(1)
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