• Benjamin Marzinski's avatar
    GFS2: fallocate support · 3921120e
    Benjamin Marzinski authored
    This patch adds support for fallocate to gfs2.  Since the gfs2 does not support
    uninitialized data blocks, it must write out zeros to all the blocks.  However,
    since it does not need to lock any pages to read from, gfs2 can write out the
    zero blocks much more efficiently.  On a moderately full filesystem, fallocate
    works around 5 times faster on average.  The fallocate call also allows gfs2 to
    add blocks to the file without changing the filesize, which will make it
    possible for gfs2 to preallocate space for the rindex file, so that gfs2 can
    grow a completely full filesystem.
    Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>