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Linux 2.6 - man page for fallocate (linux section 1)

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FALLOCATE(1)									     FALLOCATE(1)

       fallocate - preallocate space to a file.

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

       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.

       The  length  and  offset arguments may be followed by binary (2^N) suffixes KiB, MiB, GiB,
       TiB, PiB and EiB (the "iB" is optional, e.g. "K" has the same meaning as "KiB") or decimal
       (10^N) suffixes KB, MB, GB, PB and EB.

       -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.

       -l, --length length
	      Specifies the length of the allocation, in bytes.

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

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

       The  fallocate  command	is  part  of  the  util-linux  package	and  is  available   from

Version 1.0				     Jul 2009				     FALLOCATE(1)
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