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    Command:

    fallocate

    
    
    

    SYNOPSIS

           fallocate [-n] [-p] [-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.
    
           -p, --punch-hole
                  Punch holes in the file, the range should not exceed the  length
                  of the file.
    
           -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/.
    
    
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