[win-pv-devel] [PATCH 2/3] Advertise "feature-flush-cache" to backend.

[<owen.smith@xxxxxxxxxx>]

From: Owen Smith <owen.smith@xxxxxxxxxx>

Suggestion to the backend to enable caching on the storage. If the
backend supports flush, then it will write "feature-flush-cache"
(to the backend area) before going Connected. If the backend does
not support flush, this flag should be ignored and the backend
should not write "feature-flush-cache" (to the backend area), or
set it to 0.
If the frontend reads "feature-flush-cache" from the backend,
the frontend will issue BLKIF_OP_FLUSH_DISKCACHE and report the
cache capability to the guest OS.

Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
---
 src/xenvbd/frontend.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/xenvbd/frontend.c b/src/xenvbd/frontend.c
index b1fa1a9..c993c25 100644
--- a/src/xenvbd/frontend.c
+++ b/src/xenvbd/frontend.c
@@ -1078,6 +1078,16 @@ FrontendConnect(
                               Frontend->Store,
                               Transaction,
                               Frontend->FrontendPath,
+                              "feature-flush-cache",
+                              "%u",
+                              1);
+        if (!NT_SUCCESS(Status))
+            goto abort;
+
+        Status = XENBUS_STORE(Printf,
+                              Frontend->Store,
+                              Transaction,
+                              Frontend->FrontendPath,
                               "feature-online-resize",
                               "%u",
                               1);
-- 
2.8.3


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