[PATCH] xen-blk[front|back] FUA additions.

[Konrad Rzeszutek Wilk]

I am proposing these two patches for 3.2. They allow the backend
to process the REQ_FUA request as well. Previous to these patches
it only did REQ_FLUSH. There is also a bug-fix for the logic
of how barrier/flushes were handled.

The patches are based on a branch which also has 'feature-discard'
patches, so they won't apply nativly on top of 3.1-rc5.

Please review and if there are no concerns I will send a proper
git pull to Jens to pick up the whole branch for 3.2.

 drivers/block/xen-blkback/blkback.c |   11 ++++++-----
 drivers/block/xen-blkfront.c        |   12 ++++++------
 drivers/block/xen-blkfront.c          |    8 ++++----
 3 files changed, 16 insertions(+), 15 deletions(-)

The full git tree is currently at my backup git tree:

git://oss.oracle.com/git/kwilk/xen.git stable/for-jens-3.2

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