fallocate man page on aLinux

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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 fallocate system call, this is done quickly by	 allo‐
       cating 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.

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

       -n, --keep-size
	      Do not modify the apparent length of the file. This  may	effec‐
	      tively  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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