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[Qemu-block] [PATCH] block-backend: allow flush on devices with open tra

From: John Snow
Subject: [Qemu-block] [PATCH] block-backend: allow flush on devices with open tray
Date: Fri, 10 Jun 2016 17:59:21 -0400

If a device still has an attached BDS because the medium has not yet
been removed, we will be unable to migrate to a new host because
blk_flush will return an error for that backend.

Replace the call to blk_is_available to blk_is_inserted to weaken
the check and allow flushes from the backend to work, while still
disallowing flushes from the frontend/device model to work.

This fixes a regression present in 2.6.0 caused by the following commit:
block: Move some bdrv_*_all() functions to BB

Signed-off-by: John Snow <address@hidden>
 block/block-backend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 34500e6..d1e875e 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1122,7 +1122,7 @@ int blk_co_flush(BlockBackend *blk)
 int blk_flush(BlockBackend *blk)
-    if (!blk_is_available(blk)) {
+    if (!blk_is_inserted(blk)) {
         return -ENOMEDIUM;

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