TODO revision 1.3 
1Important unimplemented features in current device-mapper implementation
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3* implement dm_dev_event_ioctl and dm_target_msg_ioctl functions
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5* write more targets mirror, stripe.
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7* snapshot target, there is some code in repository already
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9* integrate LVM with sysinst, so we can configure LVM during installation
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11			Pain in the sky tasks
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13* implement multipath target for network attached storage devices.
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15* Cluster lvm extension, NetBSD needs Distributed Lock Manager for this.
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17* write GPL free libdevmapper and lvm2tools.
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