[Xen-devel] [PATCH 0/2 0/2 v2] Add Trim operation

[Owen Smith <owen.smith@xxxxxxxxxx>]

* Updated value of BLKIF_OP_TRIM to 5 after comments from Jan Beulich
* Added explanation of trim operation after comments from Keir Fraser


This set of patches for xen-unstable and the pvops dom0 kernel extend the 
current block device shared ring and add the trim operation interface.
The first patch in both series moves the request specific fields to a union.
The second patch in both series adds the trim operation.

xen-unstable
------------
1/2 : reorganises the block ring protocol to move the operation specific
      fields to a union.
2/2 : adds the trim operation definition and structure to the union.
               
pvops dom0
----------
1/2 : reorganises the block ring protocol to move the operation specific
      fields to a union.
2/2 : adds the trim operation definition and structure to the union. Also
      adds a BLKIF_RSP_EOPNOTSUPP response in blkback for the trim operation.
                     


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