[PATCH] Xen block improvements for 3.3 [secure-discard flag](v1)

[Konrad Rzeszutek Wilk]

Way back in 3.2 time-frame we worked out some of these patches and how
to improve the code. I don't think I had posted them after we chatted
about what to do or how to do it...

Either way, posting them here to kick-start the conversation and
see if we can improve these patches some more. I've been running
with these patches for some time now so I am quite confident that I got
the 32-bit to 64-bit structure padding worked out.

(Ran it with old guests/new guests/32-bit/64-bit/Linux/Windows
combination. Around 18 different scenarios).

Konrad Rzeszutek Wilk (3):
      xen/blk[front|back]: Squash blkif_request_rw and blkif_request_discard together
      xen/blk[front|back]: Enhance discard support with secure erasing support.
      xen/blkback: Move processing of BLKIF_OP_DISCARD from dispatch_rw_block_io

Li Dongyang (1):
      xen-blkback: convert hole punching to discard request on loop devices

 drivers/block/xen-blkback/blkback.c |   84 ++++++++++++++--------------------
 drivers/block/xen-blkback/common.h  |   67 ++++++++++++++++------------
 drivers/block/xen-blkback/xenbus.c  |   12 +++++
 drivers/block/xen-blkfront.c        |   77 +++++++++++++++++++++-----------
 include/xen/interface/io/blkif.h    |   40 ++++++++++++++---
 5 files changed, 169 insertions(+), 111 deletions(-)

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