VAAI support

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The VMware vStorage APIs for Array Integration (VAAI) allow common VM disk operations to be sped up including

  1. Atomic Test and Set (ATC): for fast LV locking
  2. Block-level Zero: for blanking freshly-created LVs
  3. Block-level Clone: for getting the array to copy LVs
  4. Block-level Delete: to clear unused space

(for more information see http://linux-iscsi.org/wiki/VStorage_APIs_for_Array_Integration )

The APIs are presented as SCSI commands and have been implemented in the http://linux-iscsi.org/wiki/LIO

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