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[Xen-changelog] [xen-unstable] blkif: add placeholder for packet extension to block interface

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1293180172 0
# Node ID ceb508436e6e45cd67dd97299e82439734147a01
# Parent  920826e80bee78d725fc3758bc7e378734d85bb8
blkif: add placeholder for packet extension to block interface

While the corresponding implementation has been in our trees for quite
a while, it's in a state that doesn't make it suitable for submission,
and the original author having left the company leaves open to find
someone to complete this work. Yet to prevent problems with other
interface extensions we'd like to keep the slot in the number space
reserved for the purpose it has been serving here.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
 xen/include/public/io/blkif.h |    5 +++++
 1 files changed, 5 insertions(+)

diff -r 920826e80bee -r ceb508436e6e xen/include/public/io/blkif.h
--- a/xen/include/public/io/blkif.h     Fri Dec 24 08:39:42 2010 +0000
+++ b/xen/include/public/io/blkif.h     Fri Dec 24 08:42:52 2010 +0000
@@ -76,6 +76,11 @@
  * "feature-flush-cache" node!
+ * Used in SLES sources for device specific command packet
+ * contained within the request. Reserved for that purpose.
+ */
+#define BLKIF_OP_RESERVED_1        4
  * Maximum scatter/gather segments per request.

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