From 9a665b2b8640e464f0a778216fc2dca8d02acf33 Mon Sep 17 00:00:00 2001
From: Peter Lieven <pl@dlhnet.de>
Date: Mon, 18 Feb 2013 13:48:31 +0100
Subject: [PATCH] block: complete all IOs before .bdrv_truncate

bdrv_truncate() invalidates the bdrv_check_request() result for
in-flight requests, so there should better be none.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Reported-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block.c b/block.c
index a4d7125eec..f184b376da 100644
--- a/block.c
+++ b/block.c
@@ -2427,6 +2427,10 @@ int bdrv_truncate(BlockDriverState *bs, int64_t offset)
         return -EACCES;
     if (bdrv_in_use(bs))
         return -EBUSY;
+
+    /* There better not be any in-flight IOs when we truncate the device. */
+    bdrv_drain_all();
+
     ret = drv->bdrv_truncate(bs, offset);
     if (ret == 0) {
         ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
-- 
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