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[Xen-devel] [PATCH 0 of 4 v2] blkif.h: Document protocol and existing extensions

This patch series attempts to document the blkif PV interface and
the various extensions to it that are out in the wild.

Changes in v2:

 patch 2 (blkif.h: Provide more complete documentation of the blkif interface.):
   o Mark backend device identification section as private to the
     backend driver.
   o Refer to docs/misc/vbd-interface.txt for the format of the
     virtual-device front-end node.
   o Correct field size for the virtual-device front-end node.

 patch 3 (blkif.h: Document the RedHat and Citrix blkif multi-page
          ring extensions.):
   o Correct node names for the RedHat/Amazon multi-ring extension.  The
     previous patch mistakenly documented the now defunct FreeBSD extension.
   o Clarify the note on multi-page ring interoperability to indicate that
     identical ring parameters should be published to the XenStore for
     all supported schemes.

 v1 patch 4 (Deleted):
   o Remove patch that added the XEN_*_MAJOR definitions.

 patch 4 (blkif.h: Define and document the request number/size/segments
   o Bump __XEN_LATEST_INTERFACE_VERSION to 0x00040201 and use this version
     to guard the change to BLKIF_MAX_SEGMENTS_PER_REQUEST.


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